allot more than i paid for it because i buy allot of box-sets with multiple games in them and i usually do it when they're on -85% sale or the like
that said, i buy allot of physical copies due to my internet being slow and 'fair use' policy
so my account wont be worth 2k+ like some people's is

and no, i cant upgrade it there is no provider other than bt in my area unless i want to pay for a second line and load balancing
I'd estimate my actual paid account worth to be around £300-400 and the virtual value of the goods to be about 800-1k or so if they were not on sale price
to me that's pretty darn awesome value as i paid that for my graphics cards alone
( being a madman and all )