I'm getting a BIG service done next week by Spannerman.
that's valve clearances, the whole lot etc.
And it's going to be about 6 hours labour i believe + parts, etc
So it costs a bit, but that's because there's a lot to do!
Way I see it is that I want my bike to last so don't want anything that's silly that could have easily been checked / fixed causing my engine to implode!
Play it safe!