of course,the fact that you own more than one bass,means you have a "collection",even if you consider the fact that you aren't collecting per se, all my basses are players that i bought at some point,and then DIDN'T get rid of. i like trying out different manufacturers,but after 35-plus years,realize i have a definite ric-bass preference. i have kept 2 of them,a 74 4000 and 2004 cii,and wouldn't mind having an 4001,too. i have other basses come and go,currently have a frankenjazz,danelectro,and a yamaha fretless. i don't really see anything else that i have to have,but wouldn't mind getting an 8 string bass again someday. strictly a 4 string guy,tried bunches of 5 stringers,just don't care that much about them. i've also owned most every Leo-designed bass at some point-a late 70's stingray was my favorite.
I just collect things that I like that are bass related and play them. 


