Because you simply don't have the content! There are very few albums on reel available to buy, and that's not likely to change.Apparently the market share of vinyl versus tape is 10 - 1 , so a record player would sell much better .
I dont understand the logic anyway , if you re into classical or Jazz why not buy a tape machine.
If you have 100 K to spend you can buy all the tapes available .
Add to that a telefunken or studer plus a external tapestage / tapehead amplifier if you feel like and you have better SQ then LP playback afaic , without having to do all these cartridge / arm adjustments
Records do not wear whereas reels do degrade after about 50 plays -- so it's far less attractive for the masses. Reels are like vinyl lacquers - they were never meant to be a long term home audio medium. But you can play a lacquer on any record player and it will sound very good, arguably better than on a reel (although there are many variables to consider).
But yeah, if you can afford a $100k+ TT, then you can probably afford a nice reel to reel machine as well