Ok so this takes around 10 to 15 minutes to compete depending on your internet speed.
seems to be unlimited for points
seems to be limited by how many times you can click on it
worth 100 points guess people have done this a bunch of times with no problem
seems to have icareerplan which pays 50 points.
Here is how to earn the free $5 ebay gift card.
The ebay daily feats offers you a free $5 ebay gift card with 2500 feat points. All the ebay feats pay double bonus points. So after signing up you simply click on the "did it" on the icreatesavings feat
you will earn 30 bonus points. Click reload on your webpage and you can click on "did it" on the icreatesavings feat
again and earn another 30 points. Repeat this process and once you have 2500 points you can redeem your reward for an eBay gift card or choose from a bunch of local offers.
Another short cut is look to the right of the page and you will see "see all ebay feats" you can simply bring up a page to keep doing the feats without reloading. (this will be a lot faster because you dont have to reload)
I know this process takes a few minutes but I have seen people jump through bigger hoops to gain $5.
reward page is here http://www.dailyfeats.com/rewards/premium
Might be worth jumping around the 3 links to keep it changed up