You can earn credits for the trips or photo blog you post, ranging from 0 to 75.. And once you have some redeemable credits, you can redeem it to get discounted priced trips... Until last year tripoto gave a all inclusive trip to one of the top 3 contributors.. But that is no longer there I think
It depends on the available credit redemption opportunities available in Get Paid to Travel section....Each opportunity has different credits to be redeemed...