...And with that you are entitled to your choice. Good for you for finding something that works in your favor. The point being stressed is the fact that a simple "donation" by registering your copy of mIRC will more than likely fix the "annoyance" factor. And yes, there is alway going to be an issue with a group of people for not registering because they could care less.
Just ask yourself this question: If you created software by yourself or with the aid of other people, in which you poured your time and resources into and is used by millions of people, don't you think you would want to reap the rewards from it?
Think about it Khaled could have made mIRC to immediately cease working after the 30 days was up until you registered it. But it doesn't because Khaled seems to be very generous about everyone enjoying his "masterpiece". Which is probably why it is so popular and people do shell out the $20.00 because it's a great program. Also, Khaled does donate money made from mIRC for humanitarian purposes. Let's not forget that.
I think that is more than fair don't you? I can't speak for Khaled, only he can, I am just making the assumption based upon the little thing known as "common courtesy". The about dialog is just a minor detail thrown into the works...its not like it stays open all the time...I think of it as a friendly reminder letting me know that this is still shareware until I register it.
In my opinion, the price of gas here in the states is more of a concern than the about dialog.