With gate 10 parking (for cars) sold out, any other recommendations?

Chance Parking?  Dunno the website.

Looks like gate 10 does still have more at other locations. 

I have a few questions about Gate Ten:

1. How secure are Gate Ten's lots? I see they're staffed/monitored 24/7, but has anybody had any issues with their vehicles while parking with them?
2. I see they're selling an $80 package that's good for all four days of Gen Con. But I'm getting in on Wednesday and checking out on Monday. How much will that add to the cost, and will I need to get separate passes for those two non-convention days?