The main problem that I would forsee is the pressure you will get to buy a property even if you haven't found what you are looking for. Also, I enjoyed the process of finding my property and I wonder wether you would miss out on this with a camera crew following you around. And......You will be forever known as the couple who bought a house on the telly and any mistakes you make (tele always try to make you look foolish)will follow you around.