Was just looking at GAME's site...it's hard to believe they have 30% of the UK market. Literally everything is like £5-£10 dearer than amazon

Very simply, they are on the high street and deal with second hand/exchanges. 

wow. 1% is incredible low.

i would say amazon is the second biggest game retailer here in germany after mediasaturn.

we just dont have any other big electronic retailer

6% is a big enough sample to base trends on. That's how statistics work.

depends on the demographics.

its not good enough as u can see on the software sales (soutpark ps3 ahead of x360 on amazon)

destiny bundle ahead of infamous second son

but its still good enough to make some educated guess

online shoppers are still diffrent from offline shoppers

We don't know if they're different, i don't like to assume things like you. It is representative and that's more than enough.

there are many demographic studies, that say exactly that :D

otherwise the 6% amazon sample would be  95% accurate in EVERY way. but it isnt.

election are the best way to prove perfect demographics by a low sample size

Of course there are various studies, but that is not conclusive like you are assuming. Representative doesn't mean 100% correct which is why i used the word. English is not my first language too, but you can Google something when in doubt instead of just hitting reply.

I read recently that it was at 6% in the US, as of a couple of years ago. Don't ask me for a link though.

everything is fine.

yes, representative doenst mean 100% accurate. but as i said, the best ones are 95% correct (election projections)

and amazon is way off from that number. so i would call it "kind of"  representative ;)