re: You get what you pay for
I pay absolutely nothing for my Gmail account.
I get an absolutely obscene amount of space (I still have the original mails from when I started the account, who cares?), I have in the past 30 days recieved 301 spam messages (Or so the spam folder tells me, I'm not going to bother counting) and as far as I'm aware, I have never lost even a single e-mail to a false positive.
And before you ask, in all my time with Gmail, from a month or two after the start of beta till now, I've recieved the grand total of 2 spam messages in my inbox.
Thusly, I pay nothing and I get far more then I could do, easily, myself, even if I were to pay for a spamfilter at my ISP and a professional spamfilter application to run on my computer. Best of all, google's spam filter doesn't gobble up my RAM and CPU time constantly.