I believe my credentials are as good as anyone's here when it come to laughing at the N-word (Nitrogen). That said, it seems to me that what some people are calling the OP's "obliviousness" is actually just persistent good manners.
I believe the OP got his question answered in among the catcalls, so it all worked out. But at the same time it looks like the rest of us got taught a good lesson here about trying to decide what other peole ought to want.
That said, nobody laughs harder than me at the idea of paying to replace 78% Nitrogen with putative 92% Nitrogen that may in fact be 78% Nitrogen with additional moisture in it. Camp on!