PrivateSend mixes your DASH coins with other users who are also using this feature at the time, making your transactions untraceable.
Users can also earn DigitalCash rewards by hosting a master node to help maintain the Blockchain. One must have a balance of at least 1000 DASH in order to host a Dash master node, this collateral is required to avoid 51% attacks on the network.
Click here for Masternode stats from masternodes.online.