I hope I'm not breaking the 'rules' of the title. I haven't been on a show, but a flat I once owned was on 'Homes under the Hammer'
Long story short...... during the 1990 property crash it had lost 30% value and the managing agents had raised the charges considerably - I found a guy who knew the legal loophole and was able to hand the keys to the Building Society. Keeping on top of what was occurring in case the BS 'got nasty' when we saw it for sale a couple of years after, we asked the estate agent what it was like and he said 'repossessed and trashed'. We certainly left it in good order, and lo-and-behold there it appeared on Homes UTH, where a couple of investment guys bought it at auction. The HUTH team went around each room, and pointed out 'great features you guys have added' which happened to be exactly as we'd left it!
We don't believe TV any more.... it's all made up.