OK, I will try to address your question directly.
In the last 4 years, over 400 new clubs have charted with the AMA. These 400 decisions were made by groups of individuals wanting the best of all worlds for their new clubs.

Let's look at what United Modelers offers. Coverage for flyers and coverage for club officers simply because they are UMA members. If you buy a policy for the landlord, he is covered with their standard policy. It appears that trip and fall type accidents, which are 50% of the claims the AMA receives, against the clubs and landlord are not covered. I am NOT an expert on UMA, and although I have asked about this many times, no one has asserted that the club or landlord is covered.

What does the AMA offer? Coverage for members. Coverage for the entire club entity, including the officers. Coverage for the landlord that covers all liability caused by the members or club activities. This includes things like car accidents on his property that are club related. Things like trip and fall accidents.

If you look at the information in the AMA club charter renewal package on the AMA web site and you look at the information on the United Modeler site I think you will find that there is no comparison when it come to club or landlord coverage. Since many clubs have used this to "close the deal" with the landlord, it is highly unlikely that he would accept the substitute coverage alternately available.

In order to allow any of your club members to be UMA members only would require that you terminate your AMA club charter, under the terms of the AMA bylaws and your charter agreement.

Of course all the other benefits to the club, landlord and members by either organization are not discussed, since that was not your question.

I don't have a numerical answer for your question as to how many. My personal observation is none. I do not personally know of one person who has switched.

JR