You don't have to. Unsubscribe until it's "finished", what exactly finished means when by it's very nature it is constantly being updated and patched, if only in terms of content (but from experience with the original CB, that isn't the case).
Most players aren't "expected" to pay ... they are willing to pay because given the choice of unfinished software or no software and more waiting, they'd prefer something that does MOST of what they want, to nothing at all. The core functionality (can you create a character using the current rules, have it make some of the more annoying calculations, and be able to print it out as a usuable character sheet?) is there ... It is merely missing stuff that is down on the priorities list ... way below the "release it on time this month" priority.
Of course I don't have to. And I won't do it.
And when I say "expected" to pay, I mean that since they provide the software on a license basis, well they of course "expect" me to pay for it. There's no doubt that those who pay do so willingly.
I don't think I'm better or smarter than anyone. Everyone is entitled to spend his money in whatever he thinks is a good investment. I'm just stating my opinions.
As long as I am concerned, a piece of software that basically all it does is create and edit documents, and is limited to just 20 of those documents, is not missing some non core functionality down on the priority list. It's SEVERELY CRIPPLED!
I mean, I can hardly create and store a sheet for a 1st level character of every class published in the core books! and not to talk about class/race/build combos!!!
I wouldn't give such a thing 1 dollar even if it was an amateur mobile phone app!
Unless they provide me something else with DDI that's worth my money, let's say, more and better magazine content, I'll guess they'll have to wait for my money unless they satisfy my personal minimal requirements.