Perhaps ASD's use of "Scam" wasn't correct, but it has always rubbed me wrong when a business requires me to name THEM as a named insured on MY insurance policy, but the WILL NOT name ME as a named insured on THEIR insurance policy. For instance, when attending an Art Show as Artist displaying/selling our Metal Sculptures, I must name the SHOW as a named insured on MY Insurance Policy to protect THEM, but they won't name ME on THEIR insurance policy to protect ME.
Seems like if it is a legitimate request, than it should work both ways. Of course if it is NOT a legitimate request, and just something they require us to do in order for us to attend a show, or in this case moor at their marina, and their attitude is "Take it or leave it", than although perfectly LEGAL, IMHO, it is pretty sleazy . . ., or some people may even call it a SCAM!