IMO fish are not pets , they're aquaruim maintainance.
fish really are FOOD.
ie; too much red algea add a yellow tang.
corals or anything in my reef hell yes!.
anything else never.( cats dogs , birds ,etc)
The questions about giving stuff up for money I find amusing...
why give up anything you love for cash? You are getting along without it the added $$ now, so aside from winning money, I wouldn't give up anything dear to me for moolah. A fish would never be dear to me, though... <_<