Actually, something similar to this could provide a bit of extra income for the site. If you look at the big PTC sites like ClixSense or Neobux, you can implement the same type of ad purchase packs... You get a lot of traffic on the website currently, so why not sell ad packs to members? You can charge a certain amount per CPM for users to advertise their other favorite sites...

For example, I wouldn't mind paying some bitcoin for a couple hundred thousand impressions or click-throughs, as long as the clicks are validated like on the PTC sites...

You can also set it so that members get higher rewards for a longer amount of time required to claim the ad click. I figure admin/site can use 50% of the ad revenue generated this way to pay back upgrades, and the other 50% could go back to the member rewards for clicking through... Thoughts, anyone?