You could also make the argument that there may be a great athlete (or 15) on a team that was in no way capable of making the Worlds trip without a paid bid. So, 5 years from now, would those athletes remember HOW they got there, or would they remember the fun, memories and opportunity they had to go?
I'm of the opinion that morals can't be black-and-white. There will always be an exception to the "rule." I don't think broke, talented kids should miss out because Mommy and/or Daddy can't pay a grand for a once-in-a-lifetime opportunity.
I'm prefacing this with this isn't the exact same situation and cheer and dance are different for a lot of reasons.
Now that I've said this, back when I danced I was on a competitive team that was still pretty new to the industry. We didn't do Dance World's but we did NDA National's in Orlando. To get an invitation you could go to x competitions and be invited OR you could hold their summer camp and get invited based off a performance.
My team, still new and not really as polished did not get an invitation based on our performance at camp while the other senior team and junior teams (two categories) did. Due to the summer camps, it was never arranged for us to attend a comp that we'd have to get an invitation so our 'shot' was basically gone. However, the senior team got an invitation based on two categories; jazz and pom. Our team, after a slight shift, became the new senior pom team. The other senior team became just jazz instead of both.
About two months before National's we were asked, as a team, if we'd want to go---it would mean more money, another trip...etc, etc. Our team and parents decided to take it. At the time I never put two and two together because I was young and new to competitive dance (I had only danced at a studio prior to this).
About a week before the competition our owner made a comment and someone said something and basically it came out that our team didn't earn the invite we were using the one from camp even though the team was 100% different. Our team had a great season, we placed well, we did well, we learned a lot and so forth; but that one comment hurt. And this is to a competition for invites not bids---us going didn't mean someone else couldn't.
Despite going, competing, and placing 2nd I still feeling salty when I think about it.
So yes, it is possible that down the road these athletes will think about it with a new perspective. To assume they won't is too generalized.
Was my experience at National's fun? Absolutely. Did I love the experience? Yes. But did I deserve to go with the team I was on? No. Would I allow my own CP to be on a team or with a gym that does this type of thing? Nope.
Ethics to me are black and white; to me, there is no grey in this situation.