If Hex sold every single card on demand at an exact fixed price, nobody would ever buy a single booster pack ever again except to actually play in a limited tournament.
"Sell packs for limited, limited feeds constructed" is a novel idea. One that isn't currently working.
They need to innovate. Arena is coming. Artifact is coming.
Hex is awesome. Get people in the door playing it to see that. Even with better advertising and a better on boarding process many people would look at $200+ decks and think "that is a neat, but expensive video game. I'll try something else instead".
I've said it once and I'll say it one more time - Hex packs cost half what MTG / MTGO packs cost. The fact that Hex constructed decks don't also cost half as much on average is a testament to things being fucked up.
I get that there are a lot of high effort elegant solutions to this. Those take time to make happen though.