I guess another way to put my comments are that this game has been out for over 3 weeks. According to the stats on this site, there are around 250 players, only 5 of which have at least 1 Imbument Point - which comes to 2%. Either people are having difficulty figuring out how to get imbument points, or they decide they aren't worth obtaining.
Take prestiging as another example. It looks like the idea is that you occasionally prestige a character for short-term benefits of slightly higher stats, in exchange for the shorter-term penalty of loosing all money sunken into abilities. However, it's not clear what prestiges are useful for which classes, as one can easily choose an attack-based class, but have taken all skill-improving talents or vice versa. Furthermore, the tiny bonuses seem dubious in the face of the large costs, at least at my point in the game.
Take the orbs as an example. It seems that the most important attribute on them is probably their level. Unfortunately, the UI concentrates on their rarity, which seems to have little to do with their power. It also indicates their type, but the meaning of those types eludes me - sometimes an orb that's stronger in every way is of a different type than the previous orb.
This game needs enough help that it's clear how to progress towards goals. At the moment, I'm not clear when it's best to prestige, what benefit(s) that will grant, what can be done with shards, etc. At the moment, I seem to be completing entire dungeons and still making essentially no progress towards Ascension.
The results of "Ending" aren't clear - from my records, it's a prestige multiplier, and an achievement. From a raw prestige multiplier standpoint, the higher 2 endings don't seem worthwhile - the time taken to get the additional money/task simply is't worthwhile compared to the several lesser completions one could make. In my Knight completion, I got 115.37x3 (for about 6 hours) (my final was 925.84), but completion of roughly 75 (Chef) or so takes less than an hour at a smaller multiplier. Once you're done bughunting, I'd take another look at your math model.
Interesting game. I was able to get Chef, Knight, and complete all the quests, stats, and skills. I should note that Ranger is more time-consuming than Knight because the hunt alone takes around 12 hours (at a multiplier of 579.74), which is more than all the needed gold in the game combined takes. I should also note that for an idle game, this is unusually short - I completed the above in less than 9 hours. Finally, i should note that there are time (the top 4) and gold (the top 2) achievements I'm not close to, despite having finished nearly all the content.
 "Endless Dream"){kind=icon}
 "Idle Quest"){kind=icon}