the problem with you as in traders in that you say 'bodge a part together like you can for an old track car' - your right , i for one wouldnt use the cossie parts as in theyve already failed in the 1st place so you have to "bodge" together a better part to replace the broken/bent on you take off. and because your profit margins decrease then you have to try and justify an increase in prices to keep your margins so the job is worthwhile doing - its business i know
if it isnt paying then up your prices - i wouldnt pay what i call extosionate amounts for std part as there just not worth it - there are 6 times out of 10 other parts that are available that will do the job equally as good that just dont say "COSWORTH" on them made by the same people