Gmail invites - perhaps time to blog a question

So I use gmail. Its a nice email service - I like the autocomplete on address feature, but still not to sure about the sorting and the multiple steps to trash messages. Plus I just read an article on Gmail at https://www.google-watch.org/gmail.html which was thought provoking at the very least on email features. But I digress.

What I just noticed is that I have 50 invites to Google. I havent raided a Beta2 bug, but I'm assuming because they are expanding the service out. Anyone else notice an uptick in the number of invites? I'm curious if this is algorithmically allocated (more for people who email more, or sign up people who email a lot...I could go on) or just somethng as boring as Google spent 1 billion dollars on new hardware and are expanding the service.

Shaykat