I Don't watch much of these reality shows, but Storage Wars seems real and is generally fun. I mean they all lose quite a bit of money at times.
One that i'm guessing is one hundred percent real is Pawn Stars, which is by far my favorite reality tv show. The workers are fun too watch, and you pick up neat bits of history along the way too.
Most of the actual pawn shop is dedicated to selling Pawn Stars merchandise now, and the staff featured in the show are hardly ever there. They cut off part of the shop and bring in the staff for filming, but the majority of the time they're nowhere to be found. Given the location of the show, it is safe to assume that some of the sellers are unknown actors, but I don't have a cite for this.