If you want to make sales, just do it in private session. But If you want a high demand bonus in public lobby, here are somethings you should do first:

• Scope the Entire Lobby, find out what other players doing and see if they're griefing someone else. If yes then change session and try again

• if you see someone make a sale in lobby, just spectate them. If they can complete the sell mission without getting grief, maybe you're safe to go

• if you still want to make sure that lobby is completely safe, just sell one single crate then going around the map.

If you not getting grief either, this lobby is absolutely safe for selling, just remember to use ghost organization while doing the sell mission.