I can see where you are coming from waterrat, but for me the main reason for a rack is to save space. For example, if i were to want display snakes for 12 adult carpets, that would mean a 4x2x2 tank per snake, so stacked in the most economical way that takes up a space of 12x8x2, which is absolutely massive and there is nowhere i could find that space. However this rack only takes up 4x4x3, so it is a massive space saver, and money saver.
But based on that photo of your shotguns (nice by the way) space doesnt look like much of an issue, as to display like that you would have to deck out a room into a giant safe with security system and heavy lockable door. Just an observation, no offense meant