Why use these broadheads?

[gloszz]

I use a fixed blade broadhead; both Montec G5 and Cabelas Copperhead fixed blade.

I bought these ones online super cheap as I won an auction 3 for $1.50 USD. Does anyone know why anyone would use them? Seems to have a chisel point on the front to break bone, and the 3 curved blades seems to be difficult to resharpen. It is good because it is not easy to pull out as you can see.