Then, there is my way.
I make a Mids build for a character (sometimes two or three builds, since we have the option), give it the full IO build compliment and take it to 50 (without using AE). I have five pages of 50s (with every AT at level cap) and only really run my main on Tanker Tuesday most days (with a Proc Monster build).
Perhaps my “endgame” should be writing up a back story for all of them. We will see what that sixth page brings.