Maybe worth to a mask or fin manufacturer.
I just don't see the enormity of the subject unless its SCUBA, where the real money is.
Is snorkeling perceived as a synonym for SCUBA by some? I am open to this....
Also, "stuff" takes away from the formal presentation of the goods covered within. All I can think of is someones garage sale section with used snorkeling stuff from his own kids's past vacations and some more of the same stuff from his neighbor's kids...
$10 seems fair (unless you bump into a manufacturer in need of a generic name to start selling snorkeling stuff on the web or something).