Your update ratio is incorrect. Rather than monthly, think about the amount of yearly updates : Melody has 8 ; DMD has 4. So, Melody has twice as many, not three times as many.
Many of us speculated in the thread just after 0.18 that the two projects could be given an equal portion of updates. This notion was flatly rejected, not doable, by a dev-teamer.
Until May 2018, no patron paid a pledge in a calendar month without receiving an update (the January 2018 update arrived in February off-Patreon). Patrons who were there supporting Melody seem to have not taken this well. As a sop, they were promised extra, special renders every month going forward. These Melody-players would predictably be even more pissed off if their total updates would be even further reduced.
I believe DMD does more business, at present, than Melody. But this is not primarily because of BMAC. Many patrons, most probably top-tier ones, are funding the studio but supporting DMD.
Without their support, Melody would be shown to be semi-popular at best.
Another very important consideration is that Melody figures to finish BEFORE DMD at the present update ratios. So, DMD can be used to transition the 3rd Patreon project. Without DMD to do this, that project would surely be launched with far fewer patrons.
Looking at publicly available data:
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Logically they have to shift from Patreon very soon, it kills of creativity, and since the start of 2018 their numbers have been declining. Now since his revenue is kept secret from Patreon, we do not know the actual shifts from Month-to-Month (people shifting to lower tiers).
Also it's interesting to note, that so far this year, whenever a new DMD update came out, their Patreon numbers also skyrocketed, while their Melody releases does not bring in new supporters.
Sadly currently BMAC has very limited reporting.
Now if we would just compare the sheer numbers they would come out at around 60% Patreon - 40% BMAC however, considering the cut and the extra Patreon currently takes, and if I would account the burst of patrons during a DMD release, the revised numbers are pretty much 50-50 currently.
Now the main issue MrDots previously said is that they do not see any Patreon competitor, which is starting to shift as
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has gone into it's beta stage.
I can just hope, but if MrDots is truly the financial genius people say he is, then he already sees this, and will do the right call. He has a growing team, and has to give more attention to their real money maker.
Most likely due to this reason I do not think, that they will end DMD at chapter 3 unless their 3rd project next year will blow up.
But these are jut speculations, I do not know the guy, but he does seem clever considering he knew how to hide their public data on their Domains and use whoisguard.