The amount of scooters in Macau is crazy. I'm sure it doesn't come close to Vietnam or other places though. Still, its a noisy ruckus all day long and most of all I am amazed I don't see more accidents. People weave in and out of traffic full of other cars and buses.
But in a city where parking spots go for a premium price, it makes economical sense to get something you can park without breaking the bank.