I think the problem with public ski schools and commercial ski lakes is they are extremely expensive and yet have very low profit margins. I believe we've done it to ourselves by demanding the latest and greatest equipment and boats and anything less is frowned upon.
I would absolutely love to ski a 1-2 year old boat on a beautiful lake with a well known pro to help me out all the time. The price I typically pay for that is somewhere around $75-$100/set. However, skiing at a friends lake who openly welcomes new skiers and has a 2000 ski nautique with perfect pass and no coaching but has the occasional weed problem charges $12/set and I'll ski with him every chance I get.
What happened to getting out on the boat with a group of friends who have a passion for watersports? You grab your wakeboarding buddy, someone who can ski the course at 28mph on a good day, the guy who can ski into 38off, the guy who's funny but is a terrible skier, and his girlfriend who wants to learn and you have a fantastic day on the lake. This is what I try to do several days a week and I feel like "growing the sport" is easy even in an area where people aren't active or outdoorsy.