Considering some people are paying $2-3k for ARs' this time around, $75k for twin 50cal isn't a bad deal.
http://www.mysanantonio.com/news/local_news/article/About-28-690-machine-guns-are-registered-in-Texas-4194032.php#photo-4024935
http://www.mysanantonio.com/news/local_news/article/About-28-690-machine-guns-are-registered-in-Texas-4194032.php#photo-4024935