The model stuff really doesn't bother me. If it keeps the magazines in business (and its a tough one) I'll live with it.
But sometimes the associations are....creative. I bought fiberglass boat repair syringes to do my N resin casting from US Marine. They sold my mailing list, apparently, to boat suppliers. Now I'm getting 'free' boat classified publications - for BIG boats. And they sold my mailing list too, I'm guessing, which is how I'm now receiving a classified ad publication for private aircraft.
My wife says 'SO WHERE'S MY 40' YACHT? WHERE'S THE LEARJET??'