Skied collegiate D1 from 04-08 in the West Coast. We had some good skiers on my team (I was 5th in our Mens slalom rotation and could get into 35' so there was a big discrepancy between most of the other teams who were struggling to make a pass. We also has some open level skiers in our region and then of course skiing nationals we got to ski against the powerhouse schools with actual "pros". Should they be allowed to ski? HELL YES. All of the "pro" skiers were just as friendly as everyone else and when it came down to watching them, everyone on the shore was amazed at watching them skiing. Yeh without them, my team would have gone from 5th or 6th place at nationals to probably 5th or 6th place at nationals (they still would have -38/-39' AM skiers) so the chances of making a big impact in overall placements might not change a bit.
But I think the most important part to take away is the "pros" were rooting along with their teammates no matter if they are running -39 or 26 long line - which is what collegiate skiing is all about - Team Pride. They were always super supportive and really wanted everyone to have fun and were partying next to you on Saturday night. In my opinion, having them only grows the sport, making friendships, and if even a small percentage of that group after college can find the means to waterski (life's expensive, especially when your in your 20s and starting a family, house, etc.), then its a WIN.