Daily ISO drop, not based on # of days played but on -TOTAL- # of levels a player has rostered, divided by 10.
Just starting? 50/50/40/40/94/94/78/60? 506 levels on your roster, you get 50 ISO a day. Not much, but you know it will grow!
Transitioning to 3*? Juggy (40) + 6x 2* maxed (144) [=864] + 40x 3* (average 127) [=5080] + 5x 4* (average 90) [=450] +255 5* == 6689, you get almost 700 ISO daily. Almost another level on a 3* a day, growing your interest in ISO daily!
Transitioning out of 4*? Juggy [40] + 4x 2* maxed (144) [=576] + 40x 3* (average 166) [=6640] + 27x 4* (average 172) [= 4644] + 2000 5* levels == 13,900, you get almost 1400 ISO daily. Only half a level of anyone past 140 or so, but you can slowly keep moving those 4*'s/5*'s up!
UPSIDES:
Encourages folks to keep every 2* and champ them fully. (Possibly 1* as well).
Encourages folks to level every 3* and champ them as they can.
Cuts down on ISO hoarding (if that’s a bad thing?)
Gives an obvious daily sense of accomplishment.
Scales for the entire play-length of any player, for any transition level.
Helps the ISO drought.
…I honestly can’t see a huge downside for this. Honestly, you could probably not divide by ten and it would still work. Considering a bunch of folks said they are 5million + behind in a recent poll, you could run anyone with the theoretical last example - and they would take more than a year to catch up.