So just to chime in on a thread I was not gonna chime in on....coming from a region of the country where Jazz is NOT POPULAR to listen to....I'd observe the following about the venues and people who go out to see live Jazz here :
Venues - they are general music venues, so they also hire pop, blues, ska, Norteno, DJ's, etc....there are no "Jazz Clubs" here, per se....at best there are places which we play were we have been able to muster a regular Jazz Night, be it once a month, twice, or once a week....and that's as far as it goes.
The Audience - varies a bit. The most solid are the older generation, those who actually were around when the giants were, so who grew up with a Great American Songbook repertoire. Or had parents who grew up with it. But then given the internet and the current easy access to a variety of genres, there are young folks 20's-30's who like the music, who have it on their playlists somewhere and who are familiar with many of the most classic recordings; many times this having come about thru initially being exposed via a move/film/tv show soundtrack. Or have parents who grew up with it.
Understand this doesn't mean Coltrane or Monk or MIles or Mingus or Brecker or Kenny Garrett or whoever....there is zero familiarity with these artists and their material EXCEPT in the tiny social group which, as noted above....consists of actual jazz musicians...and their significant others. It means 'familiar' with Billie, Ella, Sinatra, maybe some Astrud Gilberto, maybe a bit of Mel Torme, etc. A fair amount of commercial success having been achieved by current artists such as Samara Joy or Jane Monheit who have really just sorta successfully (and often tastefully) 'repackaged' this sort of material to provide another avenue for folks to become exposed.
You get the pattern here ? Vocalist Jazz, not instrumental. Will they go out once in a while to listen to a local live group, and while they will sit thru a night of G.A.S.B. material...sung by a decent vocalist...they will probably leave after a set or set and a half of instrumental jazz which is bop, post-bop, neo- whatever you wanna call it. Or if they stay they'll be staying because their friends are hanging out at the bar or club and socializing, not because they are listening to the music (or even acknowledging the band).
So this ramble....I suppose just noting that for SOME places, with whatever them the venue wishes to project....will incorporate JAZZ as a live music offering...knowing there is a niche market for it, even if that market is 1/4" deep, it has a marketing element to it. But the people who would actually come out and watch...they are 90% generalists in their musical tastes and their Jazz proclivities go only as far as what many current jazz instrumentalists would consider 'trite'. So it (jazz, limited scope of sub-genre) has a value as a 'product', even here in a region where it is vastly less popular than the usual music genres.
And the majority of folks here, non players, who would describe themselves as 'jazz fans' mean it only to the degree of the GASB material...they have zero familiarity nor affinity towards the classic instrumental stuff of the 50's thru 80's.