Okay, okay, okay. Wait. The bitcoin company sells you these 'blocks' of data that have bitcoins (digital codes) in them. But there will only ever be a finite amount of bitcoins (they'll all be discovered eventually).
So, the faster computer/banks of computers you have, the more bitcoins you'll have. Buying the opportunity to mine them now, for whatever they cost, gives you a bigger share of the overall number of bitcoins...
They're propagating the currency. Tbh, it sounds well dodgy. How much is a block?
Yes, but as I said earlier, there's a catch with the difficulty metric.
The more computing power that's thrown at them, resulting in them being found more quickly, makes the rest even more difficult to find. The more that are found, the harder it is to find the rest.