I think you may find that one reason some dommes ask this (me, for instance, I am a domme/switch) is that for some unaccountable reason in many places there seem to be quite a number of male subs for every domme. You tend to get contacted a lot by people who are eager to tell you in great detail what you should do to them, while what you (or at least I) want is a relationship, or at least a play partner. In other words, something mutual. I am not a service organ, but get approached as if I were, rather than a human being with own interests. Thus, the expression 'what will you do to please me' is often a way to weed out people who haven't given the idea of what the partner might want a second thought.
Secondly, BDSM are so many things, from care free play to dead serious submission, and again, the expression 'what will you do for me' is appropriate and useful if what you want is dominance and a sub who wants to serve.
There is no 'of course' in BDSM, we are a much too diverse bunch of individuals for that. So no, not everybody want a domme in costume, some do not have this fetich, others are more interested in the personality of the person than the outfit, and for some, who may want a more life-style kind of relationship, it is not relevant, at least not on a daily basis.Of course people have fetishes and want there Dommes to be in "costume" if it was not pleasing to them why would they pursue it? Plus in my opinion a Domme who does not present themselves well does not have the self respect to demand respect from someone else ( that is totally just me).
As for me, my self-respect is not depending on costume or no costume ;-)
We had a saying where I come from, that if you could not dominate someone either naked or in daily clothes, you should hang up your whips ;-)
Reach out! You have to be kidding, we are being flooded as it is!Truthfully I think the Dommes should try to reach out to the male subs, you wanted the power well it comes with some responsibility. Some of these subs will be thrill seekers, some just curious and willing to explore, and some will be serious about the lifestyle. I my opinion it is the responsibility of those at the top to guide those that are new to the lifestyle.
As for the rest, I think you will find that on this site people do try to share experiences and help each other as best we can.