Seatposts on non-folders are greased as a matter of course upon assembly. Keeps the seatpost from corrosion welding to the bike frame. On a folder, where the seatpost is moved every time the bike is ridden, not such a big deal and may even be a drawback because of the greasy mess.

Greasy seatpost is normal, but for a folder, you could clean it up to make things less messy.