It used to be Greentree (a Saint Paul firm) that did a lot of experimental financing (and also mobile homes). Then they got swallowed up by a bigger financial institution (I can't remember which one) that became the poster child for subprime loans and the financial meltdown.
I turned to AOPA this week for some help with my 3rd class medical renewal. Their response was that I'd have to pay for the advice with some program they're selling.
AOPA's third-party company relationships is the way AOPA makes more money, whether it's pitching term life insurance, financing an airplane, or getting a credit card. They're not innocent bystanders to those services.
That said, experimentals have never been AOPA's thing, so I'm not entirely surprised by your experience.
Still, there are opportunities for aviation organizations who claim to be working for aviation's future, to consider what role they can play with the idea of putting someone's tush in their own airplane.