When I was doubling bass guitar and upright bass I used a Radial Bassbone.
I've played with a guitarist who had five white Stratocasters each in a different tuning with a label (e.g. 'open G') on the top horn. Until he got some electronic gismo that altered the tuning to whatever he asked for, and hence he needed only one Stratocaster.
If I fell into thinking a new bass (however expensive) was what would make me play better then I would give myself a stiff talking to and increase my practice regime.
One day, many decades ago, in maybe 1980, I was walking down the street wearing a grey trilby.
A man stopped me and said 'Why did you buy a hat like that when instead you could have spent your money on drugs?'