The only reason the cup has so many poly's is because the creator froze the object for better smoothness. You don't have to make it so high poly.
For the half-pipe i think that the creator was going for some kind of low-poly look so he didn't bother making the side polygons.
Are these the answers you were looking for?
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Johnny was a chemist's son, but Johnny is no more.
What Johnny thought was H2O was H2SO4.
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