As said previously, its all the work that goes i to getting the part. You need an actual part,called a pattern, then that needs prep work, then there is making the mould, then prep work for getting the mould ready, then there is actually making the part,and then trimming it up ready for a customer. Yes,i often baulk at prices for some fibreglass stuff, but when you realise the work and time that goes into actually getting the end product, it seems a little more worth the money. And thats before you sell it to a shop who are supplying to customers. The quality stuff will have had the work done to makesure the pattern is exact,then the mould is made slowly and left to cure properly, and then the same with the part itself. If parts are released from the mould after then have just cured, they distort and twist.