Robert,
Most of the really worthwhile sites that I visit that DON'T have anything to sell have a patrons section and you can't view many of the areas without becoming a patron member. It costs about $25 a year.
I just hit the paypal here and donated.
I never have liked the signal to noise ratio at most of the sites and generally migrate to one that gets above most of that.
My interests are models, hunting, four wheeling, archery, etc. Each of those interests has a site that I've gravitated to and willingly pony up the annual fee. Interestingly enough I don't subscribe to any magazines. I get all I want and more quicker and with more detail via the net.
My point in all this rambling is to encourage you to consider taking a pay to play position.
You have a high quality site, well organized, just a small number of folks interested in this niche hobby.
Lane