You are talking about a given coin, I'm talking generally about PoS coins. You also know that very well to build a mining farm what can mine a meaningful amount of coins can be expensive (depending on the chosen type of coins). Running such a farm cost a lot. Also such farms are not holding their value and going to be obsolete relative quickly. On the contrary if I pick a PoS coin, after my initial "investment" I do not need to spend too much more on it.
Meaningful? The fair amount of coins you should have compared to others having the same machine and using the same energy to mine?
Yes that's how it should be.
I agree buying coins and holding for POS only is easier to accumulate big chunks of the minting. However, the source you are buying them from is able to manipulate the entire market from behind an ICO. This is where the scams set it.
With POW you can mine and use the same energy and invest the same as others in machinery or you can buy from exchanges after the coins have been mined and distributed at the market rate set by all miners selling and all those willing to buy.