To play Devil's advocate here for a minute:
What would stop me from saying I'm you, take competition results and a photo of your truck and submit it to MBRP for contingency money? If a guy finds out Joe Schmoe runs brand X equipment and does not bother to seek contingency money for that product, what stops him from pretending to be Joe and collecting the money?
Anyone can take a picture of a vehicle and installed equipment (tons of pictures all over the net), it becomes much harder to forge a receipt (not impossible, but not as easy). I think it's manufacturer's way to keep from paying out money they shouldn't and therefor keep product costs down.
You know you're you, and you know you bought those items (or at least run them), but some guy in an office has no proof of it (and with photoshop as good as it is today, anything is possible in a picture).
I know you wouldn't fraudulently claim something, but MANY people would (and do), so companies have to protect themselves....
If they have a policy, and you didn't follow it, then say the company "sucks" and they are "cheating" because YOU didn't follow the rules, that is a little messed up (in all actuality you are trying to cheat by getting around the rules). In order to win races/pulls/etc. you have to comply by the rules (weight, safety, etc) in order to collect points/prize money/trophies, I see this as no different.
As with some pulling organization, some do very minimal teching and people get away with stuff, then they go to an organization that actually techs, then they get pissed off because they can't pull. It's not the tech's or organization's fault, yet they get called all sorts of names....
It looks as if this is the same way. Some companies don't "tech" your credentials as stringently to collect contigency money, others do.....but don't hate them though.
Would it be nice if they just said, OK here's your money....Yes, but you can't get upset with them if you don't follow their policy and they refuse.