Because of the reasons stated above. Plus my rmr with a 7.5 moa dot on my g23 still allowes me to hit a bowling pin at 50 yards. Youre oly talking about an 8" dot at 100 yards.
Thanks for the input guys. In the end the dot size came down to cost, I could get a 3moa dot model cheaper. I picked up a Burris mount because of the cost.