Personally I think that Nuru is a bit of a waste of time - it's very messy! It depends on what you want to do. If you want to do an actual massage then don't bother. If you want to do a sexy slidy b2b session then it can be fun. I think guys want it because a) it's trendy and b) they've seen it in Japanese porn films!
I use almond oil because it smells less than grapeseed and I can buy it really cheap in the supermarket!
When I was doing indie erotic massage (with HR) in London I was charging (incall) ?120 for b2b, ?100 for nude, ?80 for lingerie and ?60 for dressed, for 1hr. That's definitely at the higher end of the scale though, most girls in London are charging about ?80-100 for b2b I think