1. (Least Expensive) Steel Chromoly------>Aluminum-------->Titanium--------->Carbon(Most Expensive)
Generally speaking, is the above categorization of pricings accurate for consumer grade quality frames?

2. I've read from at least 4 years ago that Steel Chromoly has experimentally been made lighter than Titanium. Have such products seen notable uses by regular consumers yet?

3. Would a simple tarp help prevent rust for Chromoly bicycles that would be parked outside?