While his nasty attitude (in the dA notes especially) makes this a valid beware, your aggressive tone in your replies to him and your journals is extremely off-putting. If you must rant and let off steam, do it on a personal account instead of one that you conduct business on. I do the same thing; god knows I'm plenty aggressive, but you need to keep it off of a commission account.

Frankly, by the rant journal posted above, I wouldn't work with either you or the commissioner. :| Your customers don't want to know how much you rage at other people.