LV taxi always try to trick you into taking the highway to the airport which is significantly more expensive than the normal way from the strip.
That's cute. Going to Las Vegas to be thrifty? What exactly is the point of that? You are aware that those huge casinos weren't built by people being smart with their money, right?
Personally I just rent a car when I go to Vegas. Costs about $30-40 a day and I can go wherever I want and parking is plentiful and mostly free. The monorail can get you to much of the strip and you'll be walking plenty anyway. Cabs can be useful but if you are going to take more than 2 cab rides a day you might as well rent a car.
Depends on what you do in Vegas. For some, renting a car in Vegas would be a guaranteed DUI.
Also parking near any strip hotel is basically the same as walking from hotel to hotel (given the distance to the "free" parking lot from the casinos).
Have you ever tried to drive on the LV strip on Saturday night (after all the people from SoCal get there)?
Or returning your rental car to the airport during peak times?
Visiting during CES?
On the other hand, if you are going to take a side trips to the Red Rock or Grand Canyon or Hoover Dam/Lake Mead, or visiting off-strip restaurants, and don't plan on drinking too much, and not driving during peak times, a car is a very convenient thing to have in Vegas.