Don't remove your plate! It's not worth having your scooter towed, and having to pay to get it back.
In Philly you will get towed if you removed your plate. This is something they've just started after aggressively ticketing Scoots and MCs for parking on sidewalks and at bike racks. To make up for it the city has a new program where scooter and motorcycle corrals are provided. I'm in the process of making a digital diagramed survey and taking photographs of each site as they are far from equal. Some have dedicated chain poles, some don't, some have clearly painted lines marking the parking area, others don't. You can pay $5.00 at a kiosk, get a printed receipt, and park at the corral all day, or move to any corral and do the same as long as the receipt is displayed. The other option is to pay $250.00 for a virtual permit, allowing you to park at any corral all day for one year. I'm waiting for my next paycheck to get mine.
I personally would like to see sidewalk parking return, but at .68 cents a day it's a good deal.
-Wolf