Well I hope you consider changing this and soon allowing USA residents to use your site.
That decision might not be theirs to make. Although I don't see any proof of a betting license on the site, they could be applying those standard Curacao betting terms which restrict countries like the United States, France, the UK, and some others.
When we are on the topic of restricted countries. @BetJA.com: I couldn't find a list of countries whose players aren't allowed to play on your site. Can you add that to the T&S or state it here for us to know?
yes, they don't have that list in their terms or faq. would be nice from betja if they include that list even if they don't have the gaming license yet. at least, the players already know if they can play here or not. the betting odds are good but what else are the activities lined up for betja to attract bettors here? aside from the multi-insurance offered here.