50/50 is just insane! Having played the game on and off for years and looking closely at what I'd need to actually achieve a maxed Hall of Monuments, the time investment is crazy huge (for me, at least, and I got to 30 with fairly minimal effort... it depends on how much you've done, of course)
I think 30/50 is decently achievable for most people, which is good considering that's where the rewards end (other than titles). Even 35 isn't quite that bad. Once you get past about 35-40 you get into needing a LOT of maxed titles to continue getting anywhere in the HoM, which just gets unsustainable for me from a "time-spent" point of view.
It also depends a bit on luck too IMO; what kind of drops/gifts you can randomly get that other people want. My friend managed to open an everlasting destroyer tonic on his main character that sold for about 80 ectos (maybe more I can't recall exactly) which skyrocketed his progress toward the 3 point Zaishen title.