[CaptainSlow]

That's like saying "oh, buying an intake manifold is a waste of money...I welded up mine for like $30 in materials". DIY kits are made for people who don't want to (or don't feel comfortable) sourcing all the materials necessary to complete a job, and take a lot of the guesswork out of the process. They lend a sense of comfort that someone with more skill than you has taken the time to think everything out, source the proper materials, and put it all together for you with instructions and support to help guide you through the process.