Congratulations on getting some new features in Windows that shipped in Mac OS X years ago.
As for me, I'm glad that I don't have to open my wallet to Jobs just to get security updates and wrapping that fish along with a few apps that Apple acquired by buying some shmoe company.
The last major update Apple charged for was in 2003, and the next one will be in 2005. That is a reasonable interval. It's not mandatory to purchase updates - many users are happy with the older versions - but the latest version (Panther) has a very high adoption rate with Mac users.
Mac OS X now has 12 million users, and seems to be well on the way to 20 million in the future.