Because me and my friends now basically know rules that can be used for any miniatures - the barrier to just buy and paint two new armies and play a game has disappeared.
Wanna play a Mordheim style battle - no worries. You don't have to read 200 pages of rules and stats. You can just go on armyforge, make the armies, and play with your new miniatures using rules you already know 95% of.
Wanna try Age of Sigmar? again - easy. But how about Star Wars? Lego Pirates? Lego Elves? Literally everything is now just plug and play.
This is truly awesome. OPR is genius.
The only downside is that I'm all out of shelf space in my apartment.