I did six months of gigs with only a secondhand Aria STB P bass and a Behringer BDI 21, straight to PA.
Total outlay £60, £70 if you include the lead.
I never had any issues or worries and would happily do it again, even using the Cruiser P bass I picked up recently for £20.
Spending money doesn't necessarily mean you've got gig competent gear, spending time maintaining whatever gear you've got usually does.