Agreed(ish). I'm sick and tired of Apple using RAM as a delineating factor in the massive price differences between models. iPod Touchs (or Touches?) and iPhones are both very different in price just because of a few Gbs of RAM.
I'm sorry, but 8Gb of RAM to take you to from 8 to 16Gb does not cost $100, even with a reasonable mark-up. And if it did, Apple should go ahead, balls out, and charge $399 for a 32Gb. Actually, that's kind of what they do with the iPod Touch: 8/16/32 are $229/$299/$399 respectively.
These things should be priced $99/$139/$199 for the 8/16/32Gb respectively. They would probably sell about 10%/40%/50% (figures plucked out of the air/my a$$) and do very well on it thank you very much.
Is it me or are you referring to storage sizes or physical memory as RAM? There is quite a bit of difference between the two. The iPhones and the iPod Touches all use roughly the same amount of RAM. From what I've read it has 128MB of RAM of which 11MB is for integrated graphics.
Now if you want to talk about storage space (4 Gb, 8 Gb, 16 Gb, etc.) that's a different story. Please use the proper terminology.