Both Marcus and Nathan started out as greenhorns once, and I don't know Nathan's story but Marcus definitely started out doing sessions for hire. His mods on his 77 Jazz were a total reaction to doing those sessions, because it was impractical for him to take subways and walk in NYC with 8 basses, so he took one good bass that he could use on everything.
But again, I must point out that nobody on here is Marcus or Nathan so there's no sense comparing yourselves to them. And in their day of doing sessions before developing their renown, things were different. So again, N/A to today. What matters is what's happening NOW.