To go pick up where I left off in the other thread:
I think it depends a lot on the sort of forces driving people about.
The Episcopal Church used to pick up a lot of people with grievances against the RC Church. (They still do, I suppose.) The varieties of grievance need not be gone into here except to note/admit that perhaps they tend to involve "liberalizations", which is to say, they reject legal decisions within the RC church.
But even so, the concept of being radically Anglican is hard to wrap one's mind around. I can conceive of it, but it lacks the, shall we say, temper of the Jurisdiction-That-Cannot-Be-Named. Or various fundamentalist groups, for that matter.
But it is the history of those fundamentalists that provides the key to understanding. Fundamentalism is specifically and deliberately reactionary, and its reaction was first to the early stirrings of critical theology and second to the growing force of "scientific" atheism. Its solution was to declare where they were theologically at the time to be an immutable point-- but more important, they were angry, and especially concerned with fighting the threat of these innovations/fallacies.
Does this sound much like believers converting to Orthodoxy because they are opposed to what they find in their own churches? Well, it should. If one is looking for an immovable point, what better than the church "founded in 33 AD and not changed since"? Orthodoxy looks uncontaminated and really, really old, so what better place to go and be angry at one's old church?
Except there's a snag. Real churches aren't unchanged. Real churches have to react to the real world, and Orthodox churches are patently caught up in this issue. So this angry convert goes to an Antiochian church, and Gasp! they've made concessions! Eventually they wash up in a ROCOR parish (if there's one handy) and Gasp Again! they're showing signs of making concessions to the MP! So the Angry Convert shows up at ROAC or some other splinter that is obsessed with its own anger with the rest of Orthodoxy, and nestles right in for a time.
But only for a time, because by now the A.C. is on a quest for Radical Purity, disregarding the one thing that everyone knows: you can't get really radical purity by affiliation. So the Angry Convert is always angry, and always directs his anger against his own church in the end, and becomes more and more extreme.