You can sell your service to people that have iPads.
This is the fundamental question of what an iPad is. Apple would like it to be treated as an extension of their store, and you want it to be like a Windows PC. Any consumer that agrees with you is free to jailbreak -- your problem is that consumers seem to have no problem with Apple's model -- they probably don't understand it, but they haven't perceived an indirect drawback either.
Developers should have their eyes wide open about it by now.
So, the right thing, if your intention is to change their behavior is to not support them. Don't buy it, don't develop for it, encourage others to do the same.
The thing is ... everyone wants one and wants to develop for them.
No, we can not sell our service to people who have iPads without paying a 30% cut to Apple.
Again, as mentioned in the article, we think there is nothing wrong with Apple having an App Store and charging a 30% fee. What's wrong is, Apple forcing everyone to use their App Store for distributing Apps.
"Don't buy it, don't develop for it, encourage others to do the same" - That is the whole point of this article.
