So I figured I'd start using Dropbox instead of Google Drive and get the 18GB expansion via fiverr.com
Installed Dropbox, set up my account and went to the "Getting Started" page. Earn a bonus 250mb for completing 5 of the 7 "quests".
So I thought WTF, sure why not even though I'm getting the 16gb boost... next thing you know it said "1 more step to earn 48GB bonus". Voila! 50GB free account.
Is this a random thing? Just tried the exact same steps for the wife and she only earned the 250mb bonus.