Silver ions do have a place, but they can also cause real problems. For one, they screw up the ability for skin cells in the first layer of skin to properly set, making for poor wound recovery. It's true silver can keep bacteria in that wound down, but at the expense of the very repair one needs.
There are other examples of pros/cons for silver ions in our bodies, but it is obvious we still have plenty of bacteria left in our gut after ingesting silver ions.