Edge aims to stake enough EOS for users so that they have enough CPU and NET to send 10+ transactions per day and plenty of RAM. The cost we present the user is calculated as a total of the following:
RAM - enough EOS to purchase 8kb of RAM
CPU - enough EOS to purchase 10ms of CPU or 0.1 EOS worth, whichever is less
NET - enough EOS to purchase 80kb of NET or 0.1 EOS worth, whichever is less
The total is then calculated in terms of BTC or LTC for the user to pay with.