what is the maximum height for sell pass ban lines?

[ChinRey]

I'm afraid not. It's a fixed 50 m above ground level, not above zero elevation.

[ChinRey]

I'm afraid not. It's a fixed 50 m above ground level, not above zero elevation.

[Lindal Kidd]

Nobody pays to get past ban lines anyway.  That "sell passes" feature never caught on.  Figure out a different way to collect money!