"-Miners typically need to sell their coin immediately as they have invested in equipment that expects a return"

Can someone please clarify for me, in layman's terms, how the investment a miner makes to acquire a coin is any more at risk than the investment a trader makes to acquire a coin?   Once the coin is in your wallet, the relative return on that coin, once sold, is identical for both cases isn't it?

Miner:  Spent $10 on equipment costs, $90 on power and cooling, received one Bitcoin worth $100

Speculator:  Spent $90 on some exchange, $10 on fees,  received one Bitcoin worth $100

Why are these two individuals in any different situation once they have turned their non-coin assets into coin?  Up until the moment the coin landed in their wallet, their pre-coin assets could have performed wildly different to each other.  But once they have been converted to coin, they perform the same?  Or am I making the mistake of thinking miners do not see themselves as speculators but as something like 'manufacturers' and are thus not using disposable risk capital to set up their operations?