I'm one of those lowly pro-am ladies of which you speak somewhat dismissively- and I'm pro-am NOT because of a reluctant Significant Other. I'm pro-am because it means I can "own" my own dancing and competitive failures, mistakes and short-comings. When I place last in a competition, I don't have to worry that I wrecked the goals of a partner. If I don't place last, well, then I thank my pro for lugging me around the floor. Either way, I pay my pro and go home without any burden of guilt.
Twice I've had an amateur partner - one didn't have the funds to take as many lessons as we'd need to progess and be competitive, and the other found that competition just wasn't what he wanted to do. Now, if I'd picked up the entire lesson tab in the first instance - how is that really different from pro-am? It's still paying a man to dance with me, isn't it???
I don't quite understand your distinction between professionals and non-professionals with regard to the development of dancing skills. I daresay there ARE pro-am ladies who can follow a non-professional - she can probably follow a highly-skilled amateur as well. But maybe she can't follow an inexperienced professional or a lower-skilled amateur. And I'll bet there ARE pro-am men who can lead highly-skilled amatuer women, but who can't lead inexperienced amateur women or inexperienced professionals.
And - gasp! - I've seen some amateur women and men who can't follow or lead anyone other then regular partner - even if they are dancing with a pro. Really, it seems a matter of the skill of the people involved, rather than purely an "economic" distinction of pro or am.
But, what do I know? Because I'm nothing more than a pro-ammer, you've already written me off as someone who can't follow anyway, and wouldn't know a good lead from a bad lead. That's fine.
But please, don't patronize me or feel sorry for me. Instead, be grateful that I don't impose my poor dancing skills on amateur men, no matter their skill level.