It is sad that they do this. they use us to bank roll their system
why is that sad? they make a product you want ....
Almost every successful product based business grows this way. If people did not buy Bitmain miners they would not have the money to innovate and bring out newer, faster, more efficient miners. And you can replace the word miners with widgets and Bitmain with any company building cutting edge products. Tesla has done the exact same thing as have 100's of brands we buy and use every day.
Bitmain has a lot of faults, like there deplorable repair system. But it's a well run business in most respects.
It's sad that they sell junk and don't warranty it worth a damn.
And we don't payf or them to invent, I'm fairly certain they keep a miner for every one or two they sell which is dumped into their farms. have you seen how big they are? we bank roll their mining.
Which would be okay if the hardware they were releasing was worthy and reliable.