I love bottoms: without them I'd have no sex at all.
There were a lot of myths in the OP which have all been effectively been refuted. I won't dwell on those.
I'll briefly deal with an undercurrent of misunderstanding about non-versatile tops: I'm one, and I know several others: many are good personal friends of mine, others I know mainly from Manhunt where we have an informal referral/critique network going on.
Aside from some bluster-balls here and on other message boards, I've never met a non-versatile top who wouldn't rather be at least somewhat versatile: we understand that we're missing something, if for no other reason than the look of ecstasy on a bottom's face in the middle of an intense, full-on fuck.
It's just not possible for us to bottom. For some, it's physical, for others it's mental/emotional; for most it's a combination of the two. I, myself, cannot be penetrated without feeling raped. That's not hyperbole: it's the plain and simple truth. I'm sure that sexual abuse I suffered as a kid had something to do with it, and I'm certain that it was compounded by my disastrous first-choice in lovers, who was brutal. When I had surgery to repair an anal fissure a few years ago, both the surgeon and one of the nurses asked me what had caused such extensive scarring on my anus: and that was 30 years later.
Telling a non-versatile top that all he needs is finding the right man is like saying the same thing to a lesbian: it's exactly the same thing.
Now, as to what makes a bottom a bottom: hmmmmmmmmmm...there are several types of bottoms, and I'm sure that within these variations an individual's mood and whatever chemistry (or lack thereof) figures in to how these types are calibrated.
There are extremely passive bottoms who like nothing more than to lay on their bellies and get pounded. These types and I rarely get along so well. A subset of this type is the bondage bottom, who is not just passive by nature but rendered literally immovable by ropes and/or other restraints. I find these guys even less appealing and avoid playing with them.
There are bottoms who are completely wrapped up in their feelings and sensations that they make you feel like a human dildo, which you basically are. Much like the first group, I tend to not play with these kinda guys either; I made an error last summer in hooking up with an old pal from a few years previously who brought along a buddy. Completely unlike our previous encounters, I was treated as some kind of stud bull, not as a person. They were very much into themselves as well, treating me as a completely replaceable commodity for the night's pleasure. Ugh!
The bottoms I prefer are equally engaged and submissive but not passive. We discuss limits ahead of time and he trusts that I will give him the best fuck possible but at my pace and following my agenda and menu (I do not play by a script, I play by a menu). There's a lovely give-and-take to this sort of encounter that works out best, not just for me but for him as well, especially if he's looking for a take-charge kinda guy. And I am something of a control freak.
Powerbottoms come in two flavors. Some are just supercharged and ultra-animated: loud, flexxy/bendy bundles of hypersexuality. I really like playing with this type and welcome his input and creativity in the whole process. These are most likely to become regulars.
The other type of powerbottom is a take-charge kinda guy who tends to push my control/authority buttons; they can be oodles of fun or pushy, greedy bores depending on my mood and our chemistry. They are most likely to get the biggest response out of me in terms of push-back, which I think is their ultimate goal all along. Provided we keep things on as sane a plane as possible, we can have lots and lots of fun exploring and pushing each other's limits and tolerances. But pushing me too far or in the wrong way will probably not result in the intended results, and I may just get up and put my pants back on.
My Manhunt profile states that I am specifically looking for powerbottoms, so I'm really familiar with the type and are the ones I'm most likely to not just hook up with, but return for seconds, thirds, fourths, etc.