Its cheaper than $90 an hr mechanic who doubles the parts cost to cover if the shop has to re pull it due to a lemon part.Thats the weight of his experience ,you want to do it yourself ,he will make sure you can ,wait for it,at a cost.He s a business man not your buddy down the street who you borrow his wheel barrel and bring it back in a couple of weeks.Thats real life ,he might sell 1000 videos a yr.if that ,he has to account for overhead ,production cost ,staff and his time to come to that number ,if $40 is what he deems the number he needs to cover those costs its his reality .