i dont want to compare each others prices here.
u know its a material world, people would rather spend the extra dough and product with a name which is also proven. The Beauty of buying say a trust turbo or any name brand is its off the shelf(bolt-on), make it as easy as possible and at the end of the day you know what to expect.
it might not interest people who enjoy life researching every aspect, ins and outs, pro's and con's. but at the end of the day everyone has a different market.
You can get someone to do it all for you etc, and run the risk of them ripping you off, or go in with a set price full instructions and try yourself.
Goes for buying a computer, it would be alot cheaper building it yourself installing the software, than going to Dick Smith/Harvey Norman and buying one off the shelf, but then again everyone may not have the knowledge and experience you do.