In theory, miners will have a better estimate of BTC future values than the manufacture.

In practice, miners might even be a little generous in their estimates (because they are self-selecting).

And more importantly, the risk is reduced. If BTC tanks, the manufacturer will have already cashed out. If BTC goes up, the manufacture will have lost some potential profits, but will still have made a decent amount.

Yea that's what I'm saying. It wouldn't be worth it unless you have really cheap or free electricity. If you're considering buying ASICs you should be very careful.