DON did 98k buys (slight asterisk as it's Meltzer reporting the number) which is an incredible number. To my knowledge, that's better than any show TNA ever did (they did 60k for Angle/Joe I) and is about half a WWE PPV from the dying days before the network started. Bearing in mind PPV is basically dead as a concept apart from big UFC/Boxing fights, that's a fantastic achievement and almost double what All In did (55k, also a very good number).
From the random bumfuck websites I was reading, it sounds like they want to do "fewer" PPVs, whether that be 12,8 or 6. Almost doubling your buys with a gap between events is certainly a strong argument for less is more.
Few caveats of course: one-off numbers aren't a strong indicator of success of course, and 2/3 came from the US (which puts it right in line with that TNA event) but it's a great start.