Generally a person gets what they pay for. In deference to vendors who produce their own product, there is more than the sum of the parts to be considered versus retail price. If it fits right out of the box this is only because the vendor/manufacturer took the time and effort to make sure it would fit. Almost every do-it-yourselfer has experienced the trial and error process that all too often accompanies a clever idea for making and installing a new part. Time is money to one who makes their living selling aftermarket goodies for us. In addition to time invested and material cost, there are product liability issues that vendors must face that us DIY folks seldom think about. Remember the $5,000,000 cup of McDonalds coffee.
Not casting any stones, just offering an additional perspective.
