I wonder how long will the difficulty keep increasing exponentially.
Manufacturers like Hashfast and Cointerra still working on their product, blackarrow is coming in. The difficulty will only keep skyrocketting once they have stable product output.
Who knows what is going on in the background, hashrate increased 50% in just half a month.

It is not wise to invest in mining if you expect to get back the bitcoin you invested. The manufacturers are getting all the edge with the offers they give. Instead of getting investors for r&d, they got all those money from pre-orders with false promises, it is easier to suck money from the masses than from a few. They only sell in limited quantity to gouge the price while in the background they might be building their own farms from the profit they got.

Bitmain is different from most manufacturers with no pre-ordering but still, the consumers are on the bad end of the deal. They sell their miners at price point that they think the miners might roi and I think they profitted a lot from that, their products BOM I believe is just at a fraction of the price they are selling.

Unlike gold shovel, bitcoin shovel can dig by itself.