just register your own domain with varying amount of Ys. At this point there is no meaningful difference between 12 Ys and 13 Ys.
Are you kidding? Nobody will take you seriously if you try to pass the 13 y hey off as the 12 y hey. How can anyone trust you when they can't even trust the domain of your email?
I am now the proud owner pv@heyyyyyyyyyyyyyyyyy.com. Looks like I was a bit slow 17ys!
Haha I wonder if basecamp people would get mad and start throwing out cease and desist letters once a bunch of people start using variation of heyyyyyy...yy.com domains for their email addresses.