Well.. some of us obsessive types find it important.
Guests will stay away from rides they find extreme or boring. Putting your coaster into green stats is the most attractive coaster for the most amount of peeps.
This is actually incorrect---green fear rating should be avoided on all but a few rides dedicated to extremophiles. If you want a ride to be very popular and have the widest possible customer base, it should have a fear between about 3.7 and 3.9, which is less than green. In this way, you attract the more adventurous half of families, all the adults, and and at least the calmer half of teens if not all of them for want of anything scarier. This amounts to about 80% of all potential customers.