You need to compare the supply and demand.
there is an excess supply for skill maps, so by chance every vote has 5 maps, generally 3/5 of those maps are skill maps (due to the excess supply) yet the "fun" maps always win, so maybe you like skill maps, but you can play that in your own time since it doesn't require team work, it makes as much sense to me as
Element TD on Multiplayer (don't get me wrong, it's one of the best TDs).