I think the main reason that the subscription model is gaining popularity is that it can discourage piracy. To prove that you have a valid subscription, you hav

I think the main reason that the subscription model is gaining popularity is that it can discourage piracy. To prove that you have a valid subscription, you have to log in each time. And it's harder to patch out a login system (especially if parts of the program code are stored server-side and are downloaded each run) than it is to patch out a simple cd key check.