According to these two posters he is. Both posts claim he ripped them off in a Fantasy Football Contest.
“Joseph Wilk is a thief, don’t do business with him.”
In addition to that, according to Soler18 on Rennlist, he stole his money and refused a refund. Only after he filed a Paypal dispute was he able to get his money back.
Would you want to do business with someone like this?