Well, low end and high ends are monocoque. Yes, it is easy to make a monocoque cheapie however the art of the monocoque is in the lay up of the fibers and choosing the right material at the right point on the frame. tubular frames are great and have their place too. the truth is all 3 construction methods : monocoque, lugged, and tube to tube all have valid applications and each has a unique feel to it.