I'm sure I must have posted my opinions on kit sharing elsewhere on BC in the past.
My philosophy in simple terms for a bass player in a band:
YOU ARE A BASS PLAYER so:
1) Buy your own bass, strings, leads, pick (if used), strap, amplifier (head /cab or combo), pedals to suit with enough spares.
2) Arrive at gig with above kit.
3) Use above kit and nothing else.
4) Do NOT let anyone else near it or lend it out.
5) Do NOT ask to borrow anyone elses kit.
15 minutes change over time is plenty to get a bass rig off stage and assemble your own. I can get mine set up and running faster than our drummer can set up his brass bits, snare drum and seat.
Someone once gave me the best answer to anyone who asks to borrow my gear:
"Would you let me shag your partner?"
The only exception to this rule is if you play a big festival and you are offered back line as part of the deal and it is contracted, but even then I have used my own - more than once.
Buy your own gear before you spend your money on booze, fags, dope and what other luxuries you desperately need.
Rant over, sorry peeps.