I'm afraid I have limited proof for this one because almost all of the discussion happened on Tapestries; it's an adult muck (sort of like a chat client, but with rooms and player descriptions etc.) and has a policy against reposting content from the muck to protect people's privacy. But if Ishara sees this and agrees that I can post my literal logs, it'd be allowed and I'd happily do so.
September 2011 I advertised some Iron Artist commissions on a bulletin board in a popular public gathering place. One of the people who responded was "Ishara". He wanted several commissions. I spent 2 hours answering his questions and he decided to get 4 commissions; two forms of the same character, two outfits each. We agreed young form would be in her late teens, since I don't draw naked kiddies.
He sent me an e-mail. He noted that payment might be delayed, via the muck I said it was fine. Later he prompted me for preliminaries, I told him I'd start as soon I got payment, since my TOS (which I showed him) states that I want full payment in advance for commissions under €50,- and the Iron Artist commissions are €30,-
He said he'd pay and I didn't hear from him again.
I was a little annoyed that I wasted so much of my time on him and I suspected he was hoping he could have made off with some sketches without paying, but since I hadn't started sketching I figured there was no harm, no foul and I just forgot about him.
Plus, given the chance he just changed his mind and was too embarrassed to just tell me I didn't bother him, even though I saw him around the muck.
Fast forward to a few days ago; I recently opened for some small, cheap commissions and advertised this on the same bulletin board. No prizes for guessing who contacted me.
Seemingly having forgotten the incident a year before he contacted me with the exact same questions as before. I verified that it was the same person by providing some info from their e-mail and told them that, in light of their non-payment I would not take on their commissions.
They replied the next day and told me "Oh well I must have forgot that then." and told me it must have been before he was kicked out of his home which he later cited was for financial reasons; I emphasize, he was negotiating 4x€30,- commissions in a period he became homeless for financial reasons.
He told me that if I couldn't understand his situation that I could take my attitude and find other paying customers and that I was rude for not accepting him as one. But if I wanted to give him a second chance he'd pay me extra this time.
As a note, his initial note asked me for an "estimate" on the commissions despite the fact their price was clearly stated at €5,- But he didn't have a lot of money and had to "budget it in" because he only gets paid once a month.
So does everyone in the Netherlands, not sure what frequency has to do with it but I digress.
I told him it was not up for discussion and blocked him. Thinking that was the last I'd hear of it.
I come into the public area the next day and a friend tells me to look at the bulletin board on which Ishara had posted a lengthy and one-sided diatribe, preceded by the weaksauce disclaimer that he didn't want to make it public, but I didn't "man up". Not sure what I was supposed to "man up" for, but what followed was a sob story about how he lost his job and his home and had no money to live off and how I was a big meanie poopoohead for not accepting his commission. I was short sighted and blah blah good riddance and I'll never contact you again.
I didn't respond in any way and just hung around with friends when Ishara came in and loudly stated on OOC that "she is ignoring Thaily now from this point on".
I filed a report with the muck's moderators, since the BB is not supposed to be used to attack people. But like I said before, just want to warn you guys; I'm really glad I didn't start without payment and glad I declined his request for a commission the second time around. His attitude is pretty entitled and generally rotten, plus his stories don't add up.
Edit: Adding proof. The stockades are the place bad muck players go for punishment. Creamwizard is the moderator who handled my report and gave me express permission to publish the stockade record of Ishara's misbehavior and punishment.
Update 5 Feb 2015: 3 years after the fact an A_B admin contacts me about this post; Ishara had made several requests of them to edit this post, I suspect this is because I once again advertised a sale on the aforementioned bulletin board. One of these requests I have obliged (changing the file name of a screenshot to remove some minimally identifying information), others I have not. Most notably the request to the admins (and I quote) "That we somehow force you to admit this was all a 'misunderstanding'."
The post is sufficiently anonymized to adhere to LJ's TOS and will stand as is. My recommendation remains that artists avoid this person.