In order to answer this question you must first realize that some people like to shoot and do shoot at distances beyond 40 yards for practice. Some of us actually practice at distances out to 60-70 yards. This is where those extra pins may come in handy.

Not everybody limits their practice sessions to such short ranges under 40 yards. There are those of us who do a little more than just hunt.

There are a lot of ways to accomplish the practice and hunting use of sights. In the past one of my favorites was to have two identical sights that fit a dovetail mount. Many pins for the 3D and practice done during about 9 months of the year. Then just change out the sight for hunting, this one with only one or two pins, depending on the setup and how I fel a particular year.

Now, for about the last three years I've been using an HHA OL-5000, single pin adjustable that covers just about all I want to do with a hunting bow. IMO this is one of the most well built sliders money can buy. No plastic, a very well protected steel pin, lifetime warranty.