Yipes - ADV is cribbing from the Media Blaster's playbook of single thickness multidisc sets and fanservicey art to push these. (The Gravion cover is particularly over the top - you wouldn't even know it's a mech show!)
Flipside, I dug what I've seen of Diamond Daydreams, and getting the whole show in a single disc thickness pack on the cheap is damned tempting, 100 disc backlog and lots of business to attend too aside.