I'm not sure about the odds but there's more than one team option. I've done one business team and one Amstel Ride Together team. The former was simply a case of applying by email and asking politely if they had a place (they did) and the latter was a ballot entry system. I would email then organisers and ask about entry for a four person business team - see what they say.
I dont think it's done by ballot for team entry, it's more a case of considerations as above being taken into account.
I agree on the 'Business' team event but the Amstel one was absolutely stated to be by ballot. I cannot of course verify whether that was the case in reality.