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Re:Ask HN: Why Gmail '50 invites left' feature still exists? by skbohra123 on Wednesday December 15, 2010 @07:18AM (#2007847)
why not just remove the line '50 invites left' and substitute it wit something better like 'invite someone'
Re:Ask HN: Why Gmail '50 invites left' feature still exists? by Andrenid on Wednesday December 15, 2010 @07:40PM (#2010593)
Probably to stop spammers taking advantage of it. Invitees don't need to verify their accounts, so a spammer could make 1 legitimate account, and then invite themselves a few hundred times for instant new verification-free spam accounts.

Just a guess.