Is there any reason to pay the fee for Experts-Exchange and ask questions there too?
There is no good reason to be on expert-sexchange.
I actually never liked Experts-Exchange anyway.
StackOverflow is free, looks better, has better functionality and is simple.
I think that StackOverflow will ground the future of online support / help communities in general. It brings fluent a fluent feeling of usage without stubbornity. (yeah, that word doesn't exist, but anyway ;p)
Also, with the time StackOverflow will have way more hits on google or other search engines than Experts-Exchange ;-)
I won't ask new questions in Experts-Exchange, but I sometimes get answers for some questions there, mostly through Google Search.
People at Experts Exchange should read Joel's article The Day My Industry Died. This is exactly what SO did to EE :)
Next time you visit EE, remember that they've updated their URL to the new Expert-Sex-Change.com. Update your bookmarks and favourite stars accordingly.
Reason: Click on EE link from google, when page loads, click on the "END" key on keyboard.
BOOM! Correct answer provided. No charge.