Yep. I've got some work at linked-in, enough to make it worthwhile, but nothing serious from that board. I've had a lot of people contact me from that board, but it's mostly the kind who never return your emails after you send them a quote, or worse an unknown author with a great new concept that will take the publishing industry by storm, and he just needs the right artist to work for free, BUT no contracts! The right artist doesn't want money up front, or a percentage of ownership and will trust that he'll "take care" of you when the time is right.
I've had more than my fair share of snotty e-tantrums when I have the gall to respectfully turn down spec work without at least some sort of a contract.