If you look at the price of transformers, caps and resistors bought at retail kits are no bargain. Only if you're in the "far right column" at Digikey, Mouser, PE, etc can you beat the manufacturer at his own game. However, having built the thing, you can tailor it's sound to your personal taste or just have fun tearing it up and doing it over. Not to mention participating in a group efort where ideas and methods are shared and tried out. Buy the right kit and re-sale is no problem. Build from scratch with the right parts and pedigree and resale should likewise be little problem. For the cost of the Paraglow or DRD 300B kit I could buy a good used CJ or ARC Amp and be done with it............. ..........But where's the fun in that?