Most people do. I used to buy used tanks and restore/repair them for resale. I'm having trouble getting broken tanks at a good price.
I recently sold about 40 tanks. For the most part I was getting around $0.60-0.70/gallon on the tanks alone. Wood stand is worth more than metal stand usually. If you have everything but fish, I would say list for $60 and hope you get $50 for it. That would be about $25 for the tank and $25-35 for stand and equip. I would still pass it up at that price, but you may get a few bites. If you don't get any bites after 4 days, relist $10 cheaper.
To compare, I just picked up a 38/30g combo (30 needed resealed) with metal stand, substrate (which I won't use), heaters, two air pumps, 6 nets, a hand full of sponge filters, air stones, 3 50lbs buckets of slate and tufa rock, a box of terra cotta pots and pvc, light strip, glass tops and a whole box of assorted filter media, parts and all kinds of stuff all for $50.