2 and 7. Free gravel? Sign me up that shit's expensive. And I think another way to interpret 7 is that you can instantly tell whether any closed container is empty or not, since you can only see into empty containers.
For some reason my mind skipped straight past 2 so I never considered it. I was going to go 5 and 7. 7 for the same reasoning as your own, and I could probably use 5 as some sort of weird toaster-only magic show to make money. 2 Is definitely the far superior moneymaker here, but I'd probably go with 5 anyway because it'd be more fun to have as an ability.
For no real reason other than it sounds reasonable in my head, my personal head canon is that you can't move anything heavier then the toaster itself. So a cloth on top of the toaster is fine, but a car just wouldn't fly.
It's fun to imagine what it would mean with no limits though. Could I send the earth spiraling into the sun simply by placing the toaster on the floor?