Would it be appropriate to wonder what yours is for asking?
And ditto to your motive(not whether it is appropriate). We could go infinite regress on this subject, but the answer is a simple one, the thread is based upon an article calling into question motives. So it would seem very appropriate for metmom to turn the question on the author. The answer to your question as to whether it would be appropriate to wonder about metmom's motive for asking would seem to lie within yourself(since wondering is a process of a mind) and therefore cannot be answered by anyone else.
And what’s your motive for asking about my motive for asking about her motive?