I signed up for a 2nd AGR account last year (when they had the 3000 signup bonus), but forgot and took my 1st trip (on that acct) on the 90th day. I never got the bonus, but I'm not going to mention it.
I'd rather just let the 220 points (from a purchase and my 1 ride) go to waste, then have AGR realize I have 2 accts, and lose my other 75K!