To simply put, "Do we really NEED ramps?" No... We don't NEED them.
However, I for one am not a big fan of the racing in this simulator, as I am using a keyboard. Instead, I do enjoy messing around.
Ramps can add to the "fun factor" for those that want them on servers that have them, and for the more "hardcore racers", guess what? Don't use them.
It's merely another feature into this game that could appeal to some.