If you bought some 6 mg max vg and mixed them together it would give you a 4.5mg 50\50 base with 20% flavor ( which is high in some cases and not so much in others) you would get a final mix that is 3.6ish. Many wouldn't be able to tell the difference between 3 and 3.6 with quality nicotine.
so yeah that stuff would be a waste of money for me. but could vape unflavored to clean attys