That's all in the title. 1 HP quests are by far the hardest, and while they can still be completed, they require a pretty high number of retries, making the reward very not worthwile. If you spend 75 gp on retries(which is in the low for most 1HP quests), and get a rare item, you are probably better not doing the quest at all, concerning the loot, unless most rare + items strongly help your deck, which is unlikely if you can complete the quest at all : even if you were certain to get a treasure, that would only be something like 40gp * 78% (rare treasure) + 200 gp* 18%(epic treasure)+ 1000 gp (legendary treasire)* 4% = 107 gp. As most of the stuff you will find is worth less to you than a treasure of the same level, the real reward is much lower than that, and more often than not negative. It might be slightly positive with membership, but barely.
Yes, please. I understand 1hp quests are meant to keep you busy for a long time, but as it stands the expected return to time of playing a 1hp quest is too low to consider.
It's not about the money. It's about the sense of achievement and prestige of having made it through one of these beasts.
Maybe not all of them, but the case can be made for some of the harder ones having an epic reward chest.