Whenever I go to an 'Ask the Imam' or an 'Ask the Muslim Scholar' site, I see the Imam or scholar start his answer with something like this:
"Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
Dear questioner! Thank you very much for your good question that reflects a true search for knowledge. May Allah increase you in knowledge and grant you success in this world and in the afterlife."
That's why I need to ask an ex-Muslim: Do imams speak this way? When an imam spoke to you that way, what did it make you think of him?
There's a difference in spoken and written adab (manners). The written adabs of things like this are very flowery and excessive. I have never heard, in person, a shaykh say 'Oh, why thank you for asking this. May allah increase you!' when being asked a question. But they do usually say bismillah, etc. Or they may start a verbal session with it and then just answer the questions each time without the formulas. Most of them are notoriously cranky and moody. I would probably laugh if I ever sat in a session and the shaykh was all 'Yes! Thank you for this question! May you be granted success! Khayr!'