A specific game like Naval Action never will be very popular (sadly) and we should be very happy if 1/3 from game buyers will back after full release date. Its simply too much time sink, too hard-core and its not focused on pirates (thanks god) which can lure a horde potential buyers - a casual players who will left after "hit the wall" first impression (exluding lovely graphic)
Since few years i advertise game on polish game forums and made our clan website as well - sadly there is only few people show some interest in this topic.