This is an interesting conversation, one I've had discussions about with certain folks. Mostly because of posters here complaining about how the Arena discounted tickets for certain games after he/she paid full price and how that wasn't good. I see something similar with this playoff ticket situation.
As a season ticket holder, you buy a full season for the guarantee you have a ticket to every game. In a perfect world, the Arena wouldn't have to discount tickets to get butts in the seats, there would be a limited number available for individual game and same day purchases. That's why you get season tickets, to not have to worry about it, to have your seat in the Arena. That's why it doesn't bother me personally when the Arena did those discounted seats. I didn't have to worry about the extra time to go buy one, worry if there would be one available and where it would be. It's the tradeoff I make.
Same with the playoff tickets. I'd rather know I have them. If I don't go, that's on me. I do like the idea of them not charging you till they know, but I really think asking them to only charge for two, then the third, is too much to ask for. Too confusing for everyone all around.
I feel there is too much whining about this. If the cost is so bothersome, don't buy them. Go in to the games you want to go to and buy it at the ticket window. It's pretty simple.