Just a few things:

If all you want is jazz tracks, you can buy just the jazz track sets. I've done it.

Some of us may reach a style saturation point, including me, but I'm not there yet.

I also believe that real tracks are here to stay. I have continually bought most of the new RTs that have come out even though I rarely use any. I want to explore them though.

I believe that BIAB/RB is a real value.....For those of us who use it a lot. If you only use it once a month or less frequently, I can see how you might feel that the upgrades are not worth it.

FWIW

Cornet Curmudgeon