1. Perma-bear miner that doesn't believe in bitcoin at all. They will sell whatever they mined for fiat.
OK. Those guys are dumping. But how much % of them are out there? If they are perm-bear, why not short directly on exchange but enter the business of mining instead?
I will say at most 5% of the miners are perma-bears.
2. Savvy miners that do calculation before any mining/selling activities.
The calculation is easy: if expected return of holding > the interest rate of borrowing, it would be beneficial for miners to borrow fiat, rather than sell bitcoins, to pay for the maintenance.
So if miners can sell at $250 within a year from now, they can generate a 25% more intrinsic return comparing with selling today at around $200. And what is their borrowing cost at the moment? 1% or 2%? Everyone can see through that 25% return is way greater than 1% interest rate, right?
What if one miner believes that he/she will never see a $250 price within one year from now? Good question, but the answer is simple. If his expectation is that low, he will choose to quit now and will not remain in the business.
So weaker hands are also shaken out in the savvy miners camp. The more stronger hands, the less dumping from this savvy miner group.
I guess there are 50%-60% savvy miners out there. And they will hold given the low interest rate and the high expected return.
3. Perma-bull miners that totally endorse the potential of bitcoin. They will not sell until bitcoin is widely accepted and price is largely appreciated. They are the remaining 35%-45% out there.
From this guesstimate, you can see NOT ALL 3600 coins are dumped everyday! Miners will do calculation before dumping. Miners can borrow fiat and can wait for a better price to sell. And by reserve selection, bears will not choose to enter the mining business in the first place.
Don't get manipulated by bears' brainwash without your own analysis.
What you say here basically boils down everything to risk factor. If bitcoin can generate 25% intrinsic return which is nonetheless confirmed, then miners would definitely hold on to their coins. However, nobody can guarantee that and hence in order to eliminate risk, they would sell. And talk about selling I don't think they dump all their coins all at one shot. Surely the right strategy would be to sell a portion and another portion to continue to hold on to it