I get the "value added" bit, but it feels like the shop has a guilty conscience lol I'd rather a shop sell me a coral and have THEM be confident that it's pest free instead of having a shop dip the corals to prove itI'm fairly positive if you don't want to dip The shop to dip them, they won't refuse to sell them to you.
This is a value added proposition from a small business looking to differentiate themselves in a saturated world of crappy fish stores. Take it or leave it. Nobody's forcing you. Just like when they say would you like your receipt, I say hell no I don't need proof. They say ok and I walk out. .