How many servos do you plan on using for your robot? A 3 dof (degree of freedom, or axis of rotation) biped will require 6 servos (which is about the bare minimum. 2 dof is doable, but with very limited mobility). A 3 dof hex would require 18 servos. Each individual servo may not require a lot of current, but the total current requirements will be the individual servo current draw multiplied by the number of servos. So it can be very easy to reach fairly high current draw with a large number of servos.
Also, if you want any sort of payload capacity, you're going to need servos with high torque ratings, and high torque ratings come with high current ratings.