This is a good idea except when a con artist adopts a puppy you were fostering after doing a interview and them giving you a huge story and how they will love the puppy and blah blah and pay a $50 rehoming fee only to find out that person is a puppy reseller who resells free or low fee puppies at a petco in a different county for $200+
But for items i dont see anything wrong about it. Kinda like picking. Everyone makes a buck.
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Noone has asked what I'm doing when I buy the stuff, but it will happen. I'll probably lie to an extent. I mean telling someone that I'm buying your 55 gallon setup with everything for $60 then going to resell it for upwards of $125-150 wouldn't go to good I would think. Most people don't care though. If the owner is selling for cheap they know it most of the time.
Animals is a whole different situation as you have said.