It comes down to the question of if it provides enough value over other competing products (which may be free or lower cost) to justify the price. If you sell 10$ widgets that solve $100 problems, you may wonder why nobody is buying your $10 widget when it "provides so much value" and it is because a $1 widget solves the same problem just as well.
Note, I am deliberately using a generic example, I use Ghostty but I haven't tried Rex yet and I have no idea how much value it provides over competing widgets)
It comes down to the question of if it provides enough value over other competing products (which may be free or lower cost) to justify the price. If you sell 10$ widgets that solve $100 problems, you may wonder why nobody is buying your $10 widget when it "provides so much value" and it is because a $1 widget solves the same problem just as well.
Note, I am deliberately using a generic example, I use Ghostty but I haven't tried Rex yet and I have no idea how much value it provides over competing widgets)