We had 25 (I think it was 25) shetland ewes sheared last year -- the shearer tried to charge us £20 but we made him take £40. I don't think he took it seriously as a job compared to the big stuff, just a friendly way to spend an afternoon and handle some unusual (to him) sheep. Plus he only lives about 3 miles from us.
If I didn't have the entertaining neighbour discount available, I think I'd be willing to pay up to £3/sheep, for someone I thought was good and who would come to me, plus I agree a minimum charge would be reasonable.
Also, to be honest, I would pay more for a shearer who I knew also just happened to be a veterinarian, because I'd figure that if he saw anything concerning while handling each and every one of my sheep, he'd let me know
