I have a license too but as I'm moving between workstations and sometimes between accounts even on the same machine, I don't always paste the license in, because it would be extra effort to dig it up and copy-paste it...

I bought it on day one when I discovered that Sublime supports Windows, Linux & Mac.

I wanted a "modern editor" after vim, which works the same way across platforms, easy to install and configure, supports proportional fonts and does save on focus lost, yet still neither a memory hog nor a snail.

I never would have paid just for getting rid of the nag screen, but I was so impressed with its quality, I just had to express my gratitude by paying. :)