I think that aquarium supplies would be an awesome choice for a raffle. I also think that a paid raffle would be worthwhile as well.
Hoever, I know that this last raffle made me a much more active participant in the board and that, I assume, was the desired result of the raffles. I'm not sure that paid raffles would have the same results.
That being said, if they want to raffle off a tig, I'd be all for it (we're allowed to be selfish once in a while aren't we?)