There are Amateurs with sponsorships who don't need to work a day job.
Plus if their country support this sport, then also gov support as add.
These even more looks like fulltime pro.
lol if by amateur or pro career you mean tournament fights then you should reconsider your opinion about what a pro is , if you don't make enough money to support a family of four you're not even close to being a pro,
Well, if about pro boxing, due to fans in cubicles it is hard to climb up.
It depends, how good PR advisor etc you have even more from fact how good boxer you are.
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The best chances have well known amateur superstars, preferably Olympic champs.
Then everyone will offer to sign you, crowd with potential agents, managers and promoters will appear without seeking.
Even then all depends from smart choice.
& Fastest climb up / pro bouts done ratio : for example Usyk. Beautiful PR team.
Still he didn't get high level debut bout.
First guy he get in pros was a guy with not bad for debut guy opponent : at least some considerable ranking points. Still a guy with 16-7-1.
Someone thinks that he get millions for this fight?
I have no doubts that he then was able to get more form ad companies even if he retired after Olympics than from this bout.
How he climbed up after this, we know.
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Nobody will give any pro tittle bout under their org to the guy that doesn't have "enough" ranking points. Debut guy doesn't have even 0,0001 point even in his own country pro boxing org. Not to talk about ranking in larger orgs.
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To climb up for not well known prospects is longer road.
How $ for first bout you can earn, it depends, sometimes is better for tea Money than take up dangerous opponent.