OK, I'll be the token naysayer. First, as the father of two young daughters who I hope to get into skiing, I'm not sure that focusing on girls in bikinis is the right message to send. Women do make up approx. half of the population after all.
Second, why are we so addicted to slalom? It's not because of bikinis (although that is a nice side benefit) but because of the speed, challenge and stoke that skiing gives us. Why turn away from the real reasons so many of us are hard-core skiers?
At lastly, we aren't the only sport that can show pictures of girls in bikinis. So can surfing, wakeboarding and others. And let's face it, we'll probably lose the battle of bikinis if that's what we chose to put as our best foot forward.
I'm not saying that showcasing some of the attractive people in our sport can't be helpful, at times (no need to cover girls up with burkas in boat ads). But "is this how we should market water skiing?" I'd say no.