I feed in my tank, and have never been bitten by my ball. When I hear things like "cage aggression" it kind of annoys me, because if you really think about it there are 2 ways to feed your snake:

1. In cage (develop "cage aggression" by classical conditioning/associating cage movement with food.)

2. Out of cage (Now if we apply the same thought process here that we do to in cage feeding then we have to conclude that your snake is now being conditioned to associate handling with being fed.)

So if we apply this equally your snake will either bite you when you get in its cage or bite you when being handled because of how it's being fed. This is not the case for virtually everyone, the whole concept is chopped liver.

Both sound silly when you put it in that context because that's such a catch-22. One feeding a week or every 10-14 days is not enough to condition your snake to associate anything with feeding except maybe its hunger. I'm thoroughly convinced that it seriously doesn't matter.