Boxe is a bit different.
If you are an A side guy, there still depends how irl they wish to handle you.
You sell tickets, bring attention, do have some value locally + preferably someone wish invest in your development.
Calculated value that you bring to promotion in this event - part of this to event's prom's expenses – opponents purse = sum.....
The problem is that the higher ranked and with better record your opponent will be, the more he will cost for event's promoter.
Short notice too not rarerly adds price.
& then ofc also is preferable to properly select these opponents.
In B side price depends from record, last fights record and ranking + plenty of other variables.
It is possible to win, usually if you are able finish the guy.
They usually properly select B side guys and to win on cards rarerly is possible too, if you are on B side.
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Still, yeah, sometimes B side guys gets more than a prospect because prospect needs bump up.
The better ranked opponent you will have, the more
expensive training and
longer prep will be needed, this
makes expenses higher than in lowest levels.
However since an opponent in better level will cost more, if you bring in the same sum as previously, you might get lesser than perviously for bums bangup if you also then sold a lot of tickets etc.
If you wish not to become a journeyman, better perpare invest more than you will get from fights, at least during first year - two years - 2 1/2 years.
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MMA too in smaller promotions might happen pretty different, like with boxing.
Sometimes might be better to pick up easy fight with guy you can bang up for 500 than dangerous opponent for 1500 for example.
Sometimes is valuable better to pay opponent more and agree with lesser payment than he will get, also accept more dangeros fight if you are sure that you will beat him up. With pro MMA loss will not be that career impacting than pro boxing, sometimes better is not to accept offer in pro boxing than agree, regardless how lucrative it might sound and regret then whole life.
pro MMA usually records are less important, u now are 22 and had lost to someone when you were 18? No one will judge that harsh, okey, guy is for example 12-2 now and last 8 fights had won? Possibly next top prospect, let's look who he had fought?
the same record for pro boxer if he did not had fought big names or at least in top 100 might mean very bad impact on career.
MMA ofc is a big risk due to injuries risk : get damaged.
/ a pro boxer not rarerly does have some other income, preferably work in gym etc alike, plus support from parents, relatives, good if some investor + some sponsors.
There ofc everything depends and sponsors might be not less harsh than fans. Prefereable is to support undefeated guy, some beginners might have some support from local supplements ( legal ) or / and sprot equipment sales business, not rarerly it is their stuff with discount or for free in exchange of a bit advertise them etc, allow list that they support you etc.
& higher ranked and especially well known guys might get a lot from such deals, not well known: good if discounts etc.
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In pro mma record numbers doesn't matters that much like in boxing.
In pro boxing these B side guys not rarerly get not lesser purse than if they fought in hometown, might be even higher + paid travel + hotel. This ofc reduces sum that is possible to pay to the A side guy.
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Paid sparring partners usually gets purse for gig + travel and accomodation expenses covered + perks ( paid meals etc ).
Therefore for a pro more comfortable is to be in large country with dense population and a lot of athletes.
If a pro is in smaller country and not close to large countries, this increases expenses on sparring, training camps.
U then travel aboard or pay them to travel to your location and help you to improve, spar etc.
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Yeah, in US happens pro boxing fights for 200 or even 100 bucks too. If bearing in mind how dangerous for career is even 1 loss on cards, it is ridiculous. Unless opponent is very easily to beatup with almost 0 risk.