I've always figured a lot of House Hunter's was faked, simply because of the time it takes to look at houses, make an offer, etc. Plus I would think that the owners of the houses they are looking at would all have to be "in" on the whole thing and that would take time to work out and plan for in advance. Plus the people on the show are bad actors (probably because they are not really actors!).
Interesting about Designed to Sell. I don't usually like a lot of those types of shows because I don't like the way they redo the house. I think a lot of the redo's look cheap. Thanks for that!