-1 The problem is that there needs to be some sort of animation so cops actually know you dealing and animations while in vehicles don't work properly, not only that the cops need a chance to do something to you its not just free real estate selling with no down sights.
The animation of dismounting your bike provides a chance for police to get you. If you could stay on the bike it would be next to impossible for non-Roads Policing officer to catch
it’s already a major advantage riding a bike in a police chase as there is not much we can do you can fit in tighter gaps and we have to be so careful when we chase a bike adding this feature would just make it completely pointless turning up to drug deals