Newbies get separated from their money in a lot of different ways. So do people in the hobby for 50y or more. Regardless, you need a standard theoretical antenna that can't exist, so that you have a consistent basis for comparison. If you make your comparison anything else, (dipole, vertical, etc.), the basis for comparison becomes meaningless, because all those are physical antennas that have site-dependent behavior. A dipole in space is different than one 10' above the ground, and one made from copper is different from one made from aluminum. The ground in Oklahoma is different from the ground in three-land (mostly these days, ours just shakes more). Having a theoretical antenna that can serve as "zero" makes other antenna comparisons meaningful because they are compared to the exact same reference.