It costs more than a normal one. But you can do a lot to improve your chances by being a very defensive driver. Always plan what you would do if a car crossed your lane, because that happens quite often. Obviously, don't drive in someone's blind spot; I try never to drive next to a car if I can avoid it.
If I have to go right next to a car, I stop near the driver to be in his direct line to the site. I have noticed that (at least in my country) Vespas are up to 30 percent expensive compared to other brands with the same specifications. The Yamaha was fun and it was a great bike for its price, but it was very close to the ground and was very light (because it's made of plastic and the Vespas are made of metal). Even when you're alone, a Vespa or a motorcycle (or sometimes a bicycle) will stand next to you at a traffic light and he'll talk.
My Vespa has some basic tools, a battery charger and all my equipment (jacket, gloves, scarf, a small towel to clean the seat after the rain and my apron cover). Since the sale price is quite high, it's not entirely wrong to think that a Vespa will be worthless. You can usually put a car and a Vespa in one lane of the road, so in the worst case scenario, if you stay alert and don't move to the next lane of traffic, you'll probably be fine driving next to the car that didn't see you and accelerate or fall behind from there. I usually get 65 mpg; my Vespa contains two gallons of gas and that usually lasts me about three weeks. I use the Vespa a lot with skirts because that's what I use most days; I have a Vespa cover that fits me like a lap blanket that I use over skirts and dresses.
You can honk the horn to get another driver's attention, but the horn of a Vespa is very nice and pleasant, so it won't convey how pissed you are. If you already have a big motorcycle that doesn't support motorways, it makes a lot of sense to have a Vespa in the garage for when you don't want to carry a huge motorcycle in traffic. This is practically my favorite thing I've ever bought for my Vespa (in fact, my parents bought it for me). There are many European series in which these humble-looking scooters participate, and they even take Vespas to off-road races.
Otherwise, you'll have to get off the Vespa to place the food in your seat, so you can just walk in. In fact, you can feel the stiffness of the Vespa chassis from the moment you sit on it and start pedaling. My next car was added by a person who was not insured, and the payment was not enough to buy a new car, but it was enough to buy a Vespa new. Fifteen years later, I have owned three scooters (two Vespas and a Yamaha Vino), and each of them has been my main vehicle for at least a few years.