People who buy miners and stay in the bitcoin economy help the bitcoin economy and community by creating velocity in the currency, and by not taking fiat out of the bitcoin ecosystem. Large businesses that dump their earnings on exchanges constantly are hurting the economy more than helping, because they are creating downward pressure on the BTC price AND making it harder for the decentralized mining process to be incentivized.
So buy your miners, buy them smart, because everytime you do, you are making people who think its a good idea to open up massive mining farms think twice. Having a centralized mining effort across 3-4x datacenters would make BTC that easier to get hurt from centralized failure, government intervention, or natural disasters.
So if you want BTC to succeed, every holder in their mother should be hosting at LEAST 1 miner.
So think of it that way ;P
You need to take an economics class.
Just like money, the economy does not blossom unless people spend it and move it around.
That is like saying, I have a tree and I am going to carve it into toothpicks, and store them here, and because I am making toothpicks they will get more valuable.
If no one knows of your toothpicks and they have no perceived value then no one will think they are worth more than you spent making them.
If you have every Bitcoin you ever mined and you havent spent any of them, you are hurting the Bitcoin economy, not helping it. (for example)