Thanks for the suggested link between difficulty and price, which potentially suggests difficulty leads higher price.

What I am trying to figure is if one invests in a miner, is the reality that the higher the BTC price goes the less BTC I will eventually be able to mine? For example, higher mining margins bring increased competition and difficulty, so you just end up mining less than expected? (i.e. price leads to greater difficulty)

Whereas if the price were stable perhaps there's a better shot at mining more BTC?

Or does it not really matter what price does, difficulty will just increase at the same rate regardless.

Hope that makes more sense. Otherwise my apologies!