Yes, it was!
I have had more come and go over the years, but 13 was the most I had at any one time. I sold these because they weren't getting played:
'73 Fender P
'78 Fender P
'73 Fender Musicmaster
'66 Gibson EBO
'05 Gibson Thunderbird
'22 Gibson LPJR DC Bass
'71 Ibanez EB3
'79 Yamaha BB2000
'98 G&L L5500
I kept these:
'69 Fender PJ - my workhorse and #1
'07 Fender Marcus Miller Jazz
'07 Fender Jaguar Bass - my dad bought this and the MM Jazz on my 16th birthday...very lucky kid!
'98 Yamaha TRB5II - my first good bass when I was 14 and the only 5 string I have loved.
Then I used the funds from the basses I sold to by a '65 Fender P in Lake Placid Blue, which is my #2

I keep the Jazz, Jag and Yamaha stored in a safe place and they do get played from time to time. The Yamaha more so, because it's a killer bass. I was playing in an afro-peruvian/salsa band for a while and it was perfect, but now I'm mostly doing blues, rock, country and Soul...the P basses rule supreme!
I feel so much
lighter mentally not having to decide what bass to bring and trying to keep up with the maintenance to keep them all playable. I do miss some of them, particularly the Musicmaster and the EBO, but I don't regret flipping them to buy the '65...it's a special bass.