First, thank you for correcting me, I appreciate you taking the time to set things straight.
As far as the milking it, I'm refering to finding a profitable niche gap in the market and not understanding what composes that niche while continuing to profit from it. any flaw in a niche such as one that revolves around comics can start small but it slowly grows and eventually consumes, as Marvel is currently learning with their comic book division and it's sales. Actually it's gotten so bad for marvel on some comics they can't even get the bare minimum orders to do printing, so you could say this is another form of mismanagement. it's a industry that nitpicks so any little error that goes on for long enough will tend to overshadow what the error is in. that's not to say risks can't be taken Ideas can't be done it's that they have to be thought through, added in a fashion that understands the universe that it exists in or create a new one altogether.
when talking DCAU you are talking 9 animated series not including movies & 14 comic book series, and of course several games. Granted games are always given some limited leniency for gameplay, but not a small mix media by any standard. so that universe is safely established the characters that are there are there, the groups and organizations that are there are there. but then someone decides lets put in things that are contradictory to what is established well beyond the alternative timeline plot, things that are so contradictory that unless explained make absolutely no sense as to their existence there, but there is no explanation. Now some of these things could work on their own but then these things bring mention of other contradictory things, again with no explanation. contradictory things keep getting added and stacked and added eventually these contradictions out shine the universe they are placed in without rhyme or reason they just are. well Marvel has already found out what happens when you keep blindly stacking contradictions.
That's not to say DCAU is not without it's contradictions, but it's contradictionss are done in such a way that they can be over looked, like you have the Talia episode in Batman beyond this explains Ra's Al Ghul's death in the DCAU but then you have the DCAU batman beyond comic story arc that introduces Damian Wayne, Bruce's and Talia's son, and the batman beyond prototype batsuit with kill function, well you have a time desynchronization error between Ra's, Talia, and Damian there, as well as Damian being the first to don the batsuit after Bruce but the story is done in such a way that it's easily overlooked or answered, because there are so many subplots and answers that make what you know about the series and characters more enjoyable. the way the desynch error is overlooked is that Damian makes little mention of his mother and that he's already replaced Ra's position within the league, which allowed for wiggle room around the error for a good story as it's made less obvious. that and it's personally hilarious to think Bruce knocked up Talia While Ra's mind was in her body as it was never established if that was the case in the DCAU, but the times do get oddly close. but yeah that's the closest thing I can think of that the DCAU does to add a character that isn't present for the most part and would otherwise be contradictory. but he's made in that universe he references what happened there and what's there so he's his own thing, he doesn't bring up things that either don't or can't exist.