We seem to be different that what you have encountered. If you read our profile, the appearance of the male half of a couple and how that strikes Mrs. Euro is our priority. Yes I do look at the profiles, Mrs. Euro's primary language is Spanish.
What I look for are possible photos of the male half, at least the physical description if there no or limited photos.
I do believe you are correct in your assessment, most profiles are written by the male, and the male does 99% of the searching.
As to why you are having problems, first do not expect people to be any less rude in this lifestyle than in the regular dating world. Just let it go. We do respond to every message, hoping that the writer did actually read our profile.
Your profile does not make it appear that your Mrs. is really into this, there are just a couple of slightly suggestive photos. You are lucky that you are in a position to be able to show your faces, be aware any site can be hacked.
Your age difference can be a factor. Although your Mrs. is stunning, for me, a little too young. I am weird, but I am just not into younger women. Are you taking into consideration the ages of those that you contact? Maybe they consider you too old and her too young? If we heard from you, we would likely take a pass because of age.
Another factor, just because you find yourselves attractive, does not mean others will share that opinion. Not important if you are a real live Ken and Barbie. Again, part of this hobby, do not take personally. This is not a dating site, this is a site to find others that want to exchange spouses for recreational sex. Different parameters.
Something to consider, start going to meat & greets. I know there have been some in West Palm. The one last weekend in Boca would have been perfect for you. Lots of people in your age group. Clubs are usually too loud, but good for the first prearranged meating.
Patience, and accepting the "rules" of this game, help in the long run.