Actually, as a web site owner, for a number of my sites, they are INTENTIONALLY USA only. Sorry that you happened to stumble across them, but I either do not care about your business, don't want to deal with the hassle (international shipped, phone, regulations, etc), or legally cannot serve your area.
"The moment you put a "country" field in your form, two things should happen:" - that sentence should give you a clue.