They pay that amount of money for the
inconvenience and certainly not for any danger. Picture it like this - I'm away from my daughter for 2 weeks, I get hooked up to this peace-pipe contraption 3 times a day and have to stay bed-ridden for an hour after each session, the food is controlled (AND crap) and we have to stay in a commune area (a bit like Big Brother) and I have blood samples taken regularly which isn't a pleasant task.
It's as safe as it can be, there are doctors everywhere constantly monitoring us and checking how we feel etc. The study went before the Board of Ethics and was cleared with flying colours.
I won't pretend that I'm doing this to further medical science - I'm in it for the money but it's also to ensure my daughter will have a large nest-egg waiting for her when she turns 18. The fee - which is a lot closer to £3k than £2k - would certainly have to be substantial to get me to agree to spend that kind of time away from her.
On a lighter note, some of the nurses in this place......corrrrrr!!!