Hyldig... sorry, maybe since I'm not an upgraded member I'm not so qualified to comment!
I've read the upgrade page and it says "Guaranteed ads" goes up from 1 to 4. If that should be "Guaranteed 1-cent ads" because they're 1-cent ads for everyone regardless of where they live, then yes, that's an extra $10.95 a year, which is a nice difference.
As for the ClixGrid, I only do it to complete the daily checklist and have done more than 2,000 clicks and won once! And that was 10 cents!
If you have a better strike-rate as an upgraded member, and you can win a few dollars more a year than what you would have won as a free member then that also helps.
I still stand by what I said that based on subhashkashyap's stats so far it's not worth him getting the upgrade because you need to earn a decent amount per day to make it worthwhile, but I now see it's easier than I thought, and this is a nice summary:
hyldig wrote: That means you would have to earn 9 $ from grid , checklist and referrals to break even inside 2 years . Yes that is more than possible .
Upgrading's still not for me because I don't have referrals or earn enough to make enough of a difference on the checklist bonus - I don't do CrowdFlower tasks because of the forced Facebook login - but, if you're prepared to work this site pretty hard and very consistently, I see it's more possible than I thought to make it worthwhile upgrading.