No problem sharpening my own blades, {fixed and expandables } I use a Gatco { like a Lansky } It just takes a bit of time and practise, I can get them as sharp or sharper than factory. Why buy new [ I'm not made of money } when the blades only need touching up from going in the quiver, it's also a part of hunting, like sharpening your hunting knives,but not to cut yourself triming tomato plants.
I use vaselene on my broadheads as it doesn't smell like oil does, and it helps seal the broadhaed in the quiver so hardly no water gets in.