Eh! Thank god not everybody thinks like that. Otheriwse you'd have a different job me thinks!
There are loads of reasons for buying trains. Some people buy them because they are in charge of TOCs and are provding a service to passengers, some people buy them because they are in charge of preserved lines, and some buy them, just because they would like to have their own train to look after.
Ooh, the thought of having a couple of coaches in the back garden!! Id never be in the house, id live in the coaches!!! Now i just need a 47 to add onto the front to provide ETH!!
Seriously though, there are so many reasons why people would want to buy a train. Perhaps its a money making scheme. Perhaps they think they can hire it to a preserved railway and make some dosh on it. Perhaps its simply a hobby. Hey, perhaps he's really Mr Branson in disguise, and he's trying to find a replacement for his pendos!!!