I think is not hard to know who are the active sources merit. I Have a partial list of them (around 30).
The sad part is that a many of them are inactive so is really hard to complete the list since some regular member spent more sMerit than them!

But your situation is quite normal.
As you may know I'm a Scam hunter on free time and quite often I receive PM about scams, is a normal situation if you are known on the community.