The "mainstream" computer at my house with the least memory (a four-year-old iMac G5) has 1.5GB of memory, so a 3MB "footprint" for Gambit is about .2% of the memory of the machine.
I have a few Gumstix computers lying around (about the size of my longest finger) that have 64MB of memory, so 3MB is about 5% of the total RAM.
I can't say that making Gambit's minimal memory requirements tremendously smaller is a high priority of mine.
Brad