What does RAM have to do with it? I think you're confusing yourself here. As for expensive RAM, it probably was expensive at first. You can probably get 1GB for the same price you paid.
I'm guessing it's Rambus RD-RAM. Last time I checked (a few years ago), you could get 1GB of DDR RAM for around $130 and 512MB of RD-RAM was around $200. I don't know if they even sell Rambus RAM anymore (I don't see any one Newegg). I remember doing an estimate
and finding that it would be cheaper to buy a new motherboard and 1GB of DDR RAM than buying an additional 512MB of RD-RAM.