The problem is you are "fishing" in a VERY small pond. More like a nearly dried up mudpuddle. Not just talking about this ite or any of the clubs you have frequented either.
Even with all the regular Dating sites out there, one has to really work at meeting others and I am fortunate enough to live in a giant fishbowl.
What it really comes down to is "preferences". We all have them. Yours will simply make finding a partner that much harder, but at least you have HOPE firsthand since you actually know someone who found success.
Without seeing one of your profiles, it simply is not possible to tell you where you might be "going wrong".
