You mean 10.5, right?

I've got a fairly large install base, and I'd like to keep them happy if at all possible. In the future, when I have to get them to buy a v2 release on the App Store, then ideally I've made a good impression on my customers and they'll happily buy a license.

It's also not that big a deal to do. As long as the developer tools continue to let me target 10.5 from 10.6, I'll be OK.