That's pretty close to being accurate TexasFan but not always true, at least not in Florida/Mississippi. Laws vary from state to state, sometimes pawn stores get shafted when they take stolen property but not always. Depends on the case. Often law enforcement will make sure a store gets what they loaned out back, just not make any interest, they don't want stores making a profit by taking stolen property.
As for the other comments, if you loan $25 you get $31.25 in return if they pay in 30 days, hardly anything to get rich with. Tools were mentioned, they are a pain in the ass. You take them from your regulars but you don't go looking for them. Stores are different of course, all are not the same but most make their big money on jewelry, gold being the big one. People will pawn that for $4/5 a gram and the pawn shop operators will scrap it for a very nice profit. That's the golden goose in this business, that's what keeps the lights on.
Guns can also be profitable but the red tape is just incredible, you don't know what you're missing until the ATF and 20 other agencies get up your ass. The amount of paperwork and red tape create almost more aggravation than it's worth. The whole business is this way, you have to be an expert on everything that comes in the store or you will be conned. Even then you must hold everything 60 days minimum and pray nothing is reported stolen or you go through the whole hassle all over again. Harder than it looks and much cleaner these days then most realize.