It doesn't make any sense. It must be a scam. Their explanation of why they pay out bitcoins to people that send them bitcons makes no sense:
Outside buyers are not needed to mine BitCoins, the servers are generating BitCoins regardless. This website is providing a service which could be considered non-profit (as we do not make money directly from our buyers). We currently are renting mining servers (rigs) that generate BitCoins. To help offset our initial investment, we decided those who are willing to help contribute to the cost of the servers are getting a share of the generated BitCoins!
"To offset our initial investment" doesn't make sense. How does my sending them 0.25 BTC and getting paid 0.33 BTC 4 days later offset their initial investment? It doesn't make sense because it would be easier and more profitable to use the generated bitcoins to pay for the servers.
Also, the fact that everyone vouching for the service is a newbie smells like a scam:
optimiystic: one post here, plus 6 meaningless posts in 6 random threads
BitCoinNewGuy: All posts support this, no other posts anywhere else
flame: All posts support this, no other posts anywhere else
blueblade123: All posts support this, no other posts anywhere else
frozeninferno: One post here supporting this, no other posts anywhere else
Keep in mind that they could easily be paying off people now in order to appear legitimate and sucker more people in, but really it looks like the newbies that say they have been paid are all the same person and just part of the scam.