The market doesn't reflect crafting. I can make 4 or 5 NQ trash items and they get discarded because they are NQ trash. Just because you see all HQ on the market doesn't mean that's all that is being crafted. If i get crafting 55 NQ, I can't even be bothered to vendor it. I stand up and discard it. Anything over 50 still has elements of randomness in them. Even 55 gear, if I don't have all HQ I can't force 100% HQ on the parts that result in an HQ item. I either need a lucky condition or a lucky run of hasty touch. Materia Cap gear isn't optional for two star. You need materia capped and as much HQ to add to Philo NQ base as you can manage. Otherwise it's back to random condition or hasty touch bombs.

Then when it's said and done, you get one and you never need to get it again. No decay.