I have a few sites I want to sell on Flippa. Problem is, as far as I am aware, the domain names can't be transferred until they are 60 days old, after they are created (at least that's what the rules on Hostmonster and Namecheap tell me). So is my only choice to sit on these sites for 60 days until I can transfer the domain names? How do all these sellers sell sites they just created in the past month or two? Any advice? Or instructions? Or help? Thanks!
You can transfer within the same registrar for as much and as often as you want. Account changes have no restrictions that I am aware of. This is just a rule for transfers between registrars.