Originally Posted by Open Jaw

You will earn E Reward dollars for every survey you complete and once you hit $25 you'll be able to transfer it to UA for 500 miles. $50 most likely will get you 1000 miles. There may be amounts for $75 and $100 as well. Each program has it's own rules and other rewards options. Some programs have only one deposit per 30 days while others make you wait 90 days to make more deposits.

I use E rewards to keep some of my accounts active.