played beta with 2 GB ram, now that I bought Alpha Squad, told I can't even install due to lack of ram
Should have read the minimum system specs then. Just go get 2gigs of ram from anywhere, cost you like £10.
People with 2 gigs of RAM will also probably have 32 bit systems, so the total price goes up to about $100 in upgrades for people who ran beta reliably to being able to run the release version.