I don't believe any Wlad Klitschko fights were ever offered on PPV in the U.S. Some of his early fights were on ESPN. He was on HBO for a time. Then he went to Showtime for a spell. Then back to HBO. And a lot of his fights weren't shown at all in the U.S. The only Klitschko PPV fight in the US, I'm fairly certain, was the Vitali-Danny Williams fight.
I don't recall that fight being on HBO or shown in the States live. The Klitschko-Chagaev fight wasn't even picked up by HBO. ESPN Classic (not even the official ESPN but CLASSIC) aired the Klitschko-Chagaev fight ... and that was a late pick up when it looked like it wouldn't air in the States at all. The Klitschkos didn't draw large TV viewers in the U.S. Which is why some networks just quit showing them.
Oddly enough, Vitali-Arreola and Wlad-Jennings were massive hits for HBO. If they did fight in the states, they did do good ratings. But for them, the money was overseas.