I would add that on the genetic "expensive" capes, very often the actual individual feathers are 8-10" long meaning you can get 3-5 flies per feather.
They seem expensive at first, but you can tie hundreds and hundreds from one cape.
Also, genetic capes are extremely uniform, and often sold by "fly size". For example, the black cape I have is sold for flies sized 16-14...and sure enough, the feathers are incredibly uniform. This means you have hardly any waste at all.