If people can't afford to purchase it, stores stop selling it and then stop carrying it so even if you can afford it, you can't find it. No ammo makes your gun useless and thus "safer."
Umm.. not really.
If people can still buy overpriced guns and mags, they can still afford to buy ammo. You are most likely curbing a very small percentage of people who cannot afford them.
Its the same as taxing gas and cigarrete products. That has never stopped people from buying them. The tax would have to be so high that is almost the same price as the product itself.
Another ploy by the goverment to make money on the people without actually achieving anything.