No, it isn't only you, people have been building their own systems for years (I built my first in '94 -- all 486 DX goodness). Sometimes though, you don't need to build a system. I like to order spare toying around with boxes on a custom order basis, as I rarely need to rip everything apart and assemble myself. The nominal $10 I'm charged over parts cost for assembling the box is worth it IMHO.