It is simple to have 2GB memory, your right. However, this doesnt help your system in the long run - unless you keep a control of what memory is being used where, and you keep the usage by Windows down, you will find even 4GB will become bogged down in hours.
Windows "leaks" memory, this something that has always happened due to the openess of the windows code, and something that will probably always happen in the future.
The real problem starts when it starts leaking to the swap (thats actually a Linux term, so as know in windows systems, the virtual memory). Its okay and quite acceptable for Windows to use a considerable amount of swap, due to the way it handles the commit charge (in Linux its different, if its using swap, there something running that shouldnt be). But once it starts leaking on the swap, you will find the system will become slower and slower due to the fact the hard drive IO is then crippled.
Now some people say, when you have 4GB of RAM, turn off the swap, but when you do this, it can have counter effects, not only can it cause system instability, but Windows likes to have adecent swap in the background just for its own comfort, some things are best left running in swap.
Tbh, if we were all running SCSI (especially on the Ultra360 interface), it wouldnt be so much of a problem, but the limitations of IDE can cripple windows over time (ie. SCSI can read and write at the same time, IDE cant, SCSI has a much wider bandwidth and more responsive IO).
These are some of the reasons Joe is surprised I have had this laptop running for nearly 12 days, because on 99.9% of Windows systems, they start running slow after a couple days, sometimes even a few hours, and need a reboot.
My laptop can take upto 4GB (i had 1GB until a memory module died), but as you can see from my strictly controlled memory usage in my sig, it isnt required, the highest I ever use really is around the 450MB level, its usually around the 250MB level.
So having an overhead of 1.7GB wouldnt help things or make things run smoother/faster.