I don't use 3D matches to sharpen my skills. I have one pin sighted in at 20 yards and I hold a little low at 10 and a little high at 30. The bow is fast enough to take care of the rest. I know what game looks like at various distances and I also hang Tinks Scent Bombs as distance markers during deer season.
Practicing with one pin on my compound is good enough for me to put game in the freezer. Heck, with my recurve, I don't even bother aiming as such - I shoot instinctively. No sights, just a bare bow. Still manage to get my deer each year.