I do not have unlimited income, so no argument this man ever makes would convince me to pay his full price for his game. Sales allow me to buy more games. A temporary minor price reduction when the game is new is fine, but the rhetoric of "not punishing early adopters," is silly. Their reward for early adopting is getting the game sooner.
The reward for patient gamers is a lower price. This is how things like games work. Something 5 years old should not cost as much as something that came out today, for so many reasons. Less demand, the fact that game design doesn't age well a lot of the time, interest in other products, etc.
This man is taking a hard-line stance that really makes no sense, based on a flawed concept of what it means to be an early adopter or what a sale is for. "You know most of those people never play your game, right?" That's great. I play the games I buy on sale, so what, exactly, does he say about me?
It's just silly.