First off, i have been building computers since i was 12 and i do admire your ambition. However, targeting tech savvy people with such a package is just not going to work.
However, if you can make a package and advertise it well, i do think that its possible to make a similar package for the computer inept. how it would work?--
Big companies like Dell, Hp, acer, ect mass produce tons of computers every year, what most don't know is that a large portion of these computers are made on almost the same exact platform. To add to this potential is that these computers are mostly modular and easy to work with.
If you could make a package that targets the low end computers with an affordable 'kit' that would make their computer run the same speeds at the higher end ones then you might have a working product but...
1.) you have a hell of a lot of bulk to order to actually be able to sell such a kit for a low enough price 2.) there are way more IT guys out there then you could even imagine, its just not going to be an easy sell. 3.) you would have to make it so an average joe could install it into his average computer but thats also a problem, most people are stupid. you would need an unbelievably huge call center. that would just never work.
and if i my some slim chance my reformatting of your idea works, you better remember me!