While I'm not the match director nor do I have any decision making authority over the Xtreme Field Target matches, I am somewhat close to the situation, being involved since the beginning, and writing the match reports.
The XFT matches in PHX have usually had some sort of prize money, since the earliest matches. Typically Robert Buchanan of AOA would show up and donate a crisp $100 to the MD to be awarded however the MD saw fit. Ben would defer to the shooters and votes of how to award it were taken at the prematch meetings. We usually have more pellet shooters than slug shooters so of course the pellet shooters vote to give it to the highest score from a pellet shooter.
More recently AOA donated LARGE amounts of prizes and prize money for the XFT Grand Prix matches, the inaugural match here in AZ as well as the GPs that have thus far happened in TX and OR and soon to be UT.
From what I've seen, AOA has wisely decided to continue to let the respective match directors run the matches and make the rules for the GP series, while "sponsoring" the matches through the donations. I read through the dissenting comments above and I fully recognize how those fears could come true if a sponsor were to try to "steer the ship" too much. That isn't happening with the fledgling Xtreme Field Target matches and I hope it stays that way.
The prize money is never about getting rich or making a living shooting field target, but it has ALWAYS infused even more excitement for the competition, before, during and after. Enthusiasm and excitement, and even bluntly speaking, a LURE, to attract attention and new shooters is something that all areas of field target that I've been involved in, are in serious need of.
Now, to answer the OPs question: no, in regular (sub 20fpe) field target matches there are not big cash payouts like the RMAC, EBR, PA Cup benchrest matches. BUT if Xtreme Field Target continues to grow and attract the interest that it has so far (that interest is driven at least partly by the prize money, in my opinion), it might get there.