Getting the prelogned nag screen already means you are using mIRC after the try-out period of 30 days. This should be enough time for you to decide to not longer use it or buy it. And well if you need more time to try it out, a nag screen is not that unreasonable.
Shareware is not a honor system.
It's simply a method for people to try out software first, before they decide if they want to keep on using it.
