I'll probably be flamed for this, but here is my $0.02...

Most people want the lowest cost, followed by flow numbers and country of origin is the least concern.

Real racers will want the highest flowing heads, but don't care much about standard port, with cost and country of origin as secondary.

There will be a few that honestly want a made in USA part, but are not necessarily the majority.

I like to have US made parts, but it's not an absolute requirement for me, although my Mopar happens to be...

Most people have a strict budget and spend their money accordingly.

Good luck with this idea!