Three flakes and you're out?

Level 5
To the admins: Have you considered blacklist for people who make a habit of flaking? I've had three in the past few days. Is there any way to put them on a warning or blacklist? I know it's inevitable some flakes but it does leave a bad impression especially when you spend time and gas money for a meeting to have them not show up.
Level 9
I've been on Offerup since 2014. People have been asking for this since the community forums opened. It's never going to happen. Quantity of users outweighs quality of users when selling advertising.