If he's doing a set he hasn't done before, and has to do artwork etc, £60 is cheap IMO unless he's guaranteed to get future orders on that particular padset. Some of the padsets artwork is complex and has to be done in layers, it all takes time. He has a job and a family to support as well, so he does find it difficult to do special orders and customs ETC
Last time i spoke to Steve, he said he was just doing the Burner ones as he has every type on file and they are much easier for him to do.