@blindguy I'm a bit late to this thread but I just want to mention a few things in a fairly simple way.
There is not a central bitcoin company. If you buy bitcoin you are buying a currency, so like other currencies you would be buying from another individual, group or a broker.
What bitcoin solved was how to have a digital currency which is not controlled by a central authority and also can not be spent twice.
If for example I was to send you a digital music file or an email you would receive a copy but I would still have a copy and both of us could make further copies.
To prevent bitcoins from being copied (spent twice) and without the need for a central authority the responsibility is shared across the entire bitcoin network by bitcoin miners.
Imagine many computers around the world checking that nobody is cheating and preventing anybody trying to spend bitcoins twice.
These miners are rewarded for maintaining the network with newly minted bitcoins. Bitcoins have only been created by mining from the very start. This is often how new bitcoins come on to the market and who you might be buying them from.
Bitcoin mining has been designed to increase in difficulty over time to keep up with advances in technology as computers improve.
Over time new bitcoins become harder and harder to mine. Also as more computers compete for the new bitcoins it becomes harder for each miner. It becomes more expensive to mine.
The final piece of genius worth mentioning is the halving. Every four years the rate of new bitcoins that can be mined is halved.
This supply shock reduces the number of new coins on the market and causes even more expense for the miners.
The next bitcoin halving in May 2020.