Yeah, the way the signup is set up, it's really kind of stupid and a little confusing. I was wondering why in the hell the Wildcard game was $70 more per ticket than the divisional round or the conference championship.
I think someone over there just doesn't know what they're doing. The process is really poorly done and the information is obviously wrong. But, it's pay-as-you-go and on the following page it does state that prices are subject to change, so I'm sure it'll all get sorted out before any charges occur.
I might be misremembering this a little, but I think a few years back you had to put a deposit down on playoff tickets before the playoff berth was even clinched. I believe it was non-refundable as well. If the team didn't have a home playoff game, the deposit would be applied to the following years' season tickets. Terrible. I'm glad they're not doing that anymore.