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Agreed. I just used Fiverr to max out on my referrals. Now I have 21.4 GB for $5 and I didn't have to bother any of my friends. :)

except of course now you have an account that can be easily identified by dropbox as "referal abuse" https://forums.dropbox.com/topic.php?id=58068#post-436831

That's an excellent suggestion. I did just the same last night.