Miserable game design for something that is trying to get players to come back every few months for content releases. "You can't play the new hero until you grind for it until you burn out or pay" is just not a compelling pitch to get people to resume playing your game.
It's only going to get worse over time as the proportion of premium characters grows... ๐
In my Call of Cthulhu campaign, a character received a cathartic, romantic love letter from his long-distance sweetheart NPC. And then the PC was killed in one shot by a sniper in the next episode before being able to write back.
It's a lot. The dice are cruel sometimes in high-lethality systems but it's made a great tragedy for the other party members- they have to share the bad news when they get back to town, and that's some juicy horror/drama roleplaying.