I started with inbox dollar in summer of 2015 and I actually cashed in three payments totaling a little over $100. I currently have over $240 in my account ready to be redeemed.
I will admit that it is frustrating after you spend sometimes as much as five to ten minutes qualifying for a survey, only to be told you are not qualified for the survey. However, if you are patient enough, you will find some that work-out for you.
Good luck.