Priority on Customer cart totaling $100 or more!
This program mainly only invites Top Dasher's. It is required to hit the rating's shown to be invited into the program in general. Personally it took me over 2,000 orders to be invited.
Since Top Dashers are prioritized orders it is unlikely these will be sent to you without it. Remember Top dashers are prioritized orders where the cart totals $30 or more as well.