Oh please, it's not an either/or type case. One can desire to continue a 'meaningful' Mahler tradition AND sell tickets - they're not exclusive. More to the point, selling tickets is a necessity ANYWHERE. The Concertgebouw - ranked the greatest overall orchestra in the world (which is truly meaningless!) - has had its own fair share of financial issues.
Permit me to ask you a question - not because I'm trying to put you on the spot - but because I would like you to really think it through. If someone offered you an all expense paid vacation to Amsterdam (flights, room and tickets) for the 2020 Mahlerfest, would you really turn it down because you think it would be meaningless? I certainly wouldn't.
Also, have you truly listened to all those recordings you're labeling as a meaningless; establishing a new tradition of laziness in the process? Some of them are very good - much better than a lot of stuff from the past. But as to be expected, some of it is better than others. And you're right, not every community orchestra and third rate orchestra (and most third rate orchestras CAN truly play these days) should be recording Mahler. THAT SAID, I have a Mahler 1 with the S.F. Youth Symphony that's really very good, recorded on tour in Berlin. In fact, I like it better than several big-name recordings of M1 that I've heard. I certainly like it better than the MTT/SFS M1.
A real laziness, in my opinion, is labeling the glut of recent Mahler recordings - which are greatly slowing down now, by the way - as 'meaningless' when one hasn't taken the time to truly cull through them. That's lazy! (and I'm not that you are someone who hasn't culled through things - we don't know each other).