Its kind of a tough one.
A Paid re-spec would mean too much "pay to win" as those who can afford to change gain an advantage over those who cant.
There is also the problem when Dev's suddenly change something critical, players make decisions based on what they know to be true at the time, if a dev decides to alter that then its not really fair on the player.
City of Heroes is a classic example of this, they ended up having to offer a free 're-spec' to all accounts after every expansion.
A good example is with the proposed changes to 'relations'. They say... and I quote :
"This is quite unfair, as these characters typically have little extension points invested in combat, so their combat extension spending comes at an expensive rate and they are forced into activities they may not prefer. "
So now, what about all characters who have spent points into combat related skills and were.. and using their own words "unfairly" forced into combat? Do we all have to petition to get that back?... you can do that now, but what about when there are hundreds of thousands of accounts?
If there were a 'paid reset' then it could be seen that Devs do it purposefully to gain a bit of cash when their next toaster fails.
Too many questions here and not enough answers.