What exactly separates this from a gambling style ponzi mining operation?
I don't quite understand. These things pop up and disappear overnight. What are we investing into exactly?
Aside from my involvement in the unofficial MinerFarm forums mentioned a couple posts above, I want to make it clear that I have no affiliation with the developer or admin or MinerFarm. That said, I've been studying the concept quite a bit to see what separates it from other similar sites, especially the various cloud mining ponzi schemes that seem to plague the industry. That said, here's a few key points.
1.) I think one of the important things to understand is that when you purchase a 10GH/s miner or even using the existing miner in the game, it isn't like some lifetime contract for 10GH/s. That mining hardware requires constant repairs and depreciates in power over time. I certainly think with some strategies in place, many individuals can get a positive return on investment, but if you just look at the fees involved on a continual basis, the need for repairs, etc - you'll find that the investments are slanted toward benefiting the admin - and rightfully so.
2.) I think if you look at the game from a more strategic stand point, you'll find that not everyone is going to have a positive return on their investment, some people are going to straight up leave, and the game also requires you to log in once every 2 days to keep your miners active. In a lot of ways, there's some similarities there with Bitcoin Faucets in that MinerFarm is constantly working to keep you engaged with the game and it's also fighting against you to ensure you don't make money and that only people who put time in and consider a plan of "attack" will end up ahead.
3.) Revenues exist with banner ads to help further improve earnings and liquidity.
4.) No one shuns casinos for being ponzi schemes, even though Casinos rely on continual "investments" to stay afloat, although the odds are in their favor. I think the case is similar here. I wouldn't call this gambling as I think you can put some thought into developing a good strategy for a return on investment, but I also don't think everyone is going to come out ahead and I think many members are going to get flimsy earnings and never even get to a point to justify the withdraw fee.
5.) The admin also uses the site as marketing for existing and stable Bitcoin Faucets, which means if traffic to those faucets improves as a result of this site, there's a justification to any losses he/she may occur if they're offset positively elsewhere.
6.) MinerFarm isn't the first game to allow individuals to invest or withdraw real money. Planey Calypso has a real economy and keeping that economy in the game alive is also reliant on user interest and player base. Such are just the risks involved in such a game. In terms of what you're actual owning, well there's no surprise that what you own is virtual, but assuming the game is sustainable, is the purchased "virtual" mining power any less real than the people who buy and sell stuff on Second Life?
I mean, these are just some things to consider.