imagine the plus highway, heavy traffic, especially when it comes to toll, everybody queued up @ the cash lane. ok you have smart tag *vpn*
bam, you still have to share the same highway with other users after the toll plaza, only thing is you're not limited by the slow cash paying process (tmnut's speed cap)
if, if, too many ppl use vpn (everyone got smart tag) you'll still be slowed down.....