Yeah... When I saw it, I thought "Oooh! That's nice!", but when I read up on the backer-limits, I was sceptical. I mean, I've been on Patreon for over a year - I've got 25 backers. I love them and appreciate them and they're awesome, but it took a long time to get there.
It's going to be the same for most people, unless they're already massively popular and for some reason don't have a Patreon yet - and I don't think those people are going to appreciate unsolicited emails from people like me.