Eddie,
Tell me you kidding with that logic. Almost all the protected rights could be argued to have a direct cost to the citizenry. it depends on which side you fall.
Lets take the 18th on prohibition for one.
How about the 21st repealing prohibition. A hell of a lot more deaths due to alcohol than firearms in the US.
Now lets go for income Tax for a literal one with the 16th. That costs the citizenry directly.
23rd with electorial college......we all see that has no cost.
25th with voting age costs our youth their voice.
every amend has a cost and benefit depending on your side. Cost of ammo is only the beginning of the problem with this law.