Originally Posted by LAX

To make more profits. With their lower rates (usually), they already have your business for that rental. Anything on top of that (ie: optional insurance, vehicle upgrades, refueling, etc.) is gravy. Plus, many people don't mind paying a few bucks to avoid hassles, which plays right into Budget's hands of padding its bottom line. Imagine how much revenue Budget would potentially lose if a roving agent can take that surcharge off with a click of a button.

LAX