How can the number of bass guitars translate into the quality of playing it? What is the goal of having 10 or 20 guitars? Is it just collecting? Investing money? Maybe nostalgia for the time when you couldn't buy it? Honestly, I don't understand...
I have 3 basses.
A P/J that belonged to my late son. I often play it to remember him. It doesn't leave the house much, except if I have a gig around hid birthday I will bring it out.
A Lakland J that was my gigging bas for over 10 years. Best sounding bass I have ever owned. But age starting catching up with me so I reluctantly (but now gladly) bought a short scale bass.
A Lakland HB30 that is my main gigging bass. The shorter scale and reduced weight make playing much easier and a lot more fun.
I have 3 electric guitars and all 3 get played regularly. All also have strong sentimental value.
I have 2 resos, 1 with sentimental value, 2 lap steels (different tunings) and 1 Mando.
I gig with bass, lap steel and Mando regularly. I play guitar and lap steel in a pick up band. Well, that is over 10 instruments for me.
I do not begrudge anyone their choice to have many basses, or any other instrument. They are things of beauty and they bring joy to people. That is enough reason for me.