Ugh, yet another example of the decline of grammar standards! Unless we think English should become more like the Chinese language where questions are made by adding the "this is a question word" to declarative sentences.
;-)
Sigh.
Yes, I know, I know.
Personally, if I were to compose such a thread title, I might have phrased it, roughly as follows: "I Would Be Grateful For Your Thoughts/Experiences on Selling A Home to Open-door".
However, - given, what seem to me to be the marked preferences of many an online audience for tight, terse, thread titles, a question mark in such a context (grammatical horror though it is) serves to alert your readership that the author of the post and thread is actually asking a question of its readership, and is looking for advice.
My own initial post in this thread was prompted by the fact that I had arrived at the thread fully intending to report it, as I had thought it was spam, and was an attempt to sell something, which was what the original thread title ("Selling Home to Open-door") seemed to suggest.
Thus, - having read the original post - I thought it appropriate to simply recommend to the OP that it be amended to make it clear that the thread was not one of those dreadful spam threads.
When tendering advice, I have found that it works better (if the intention is to have the title amended so that what it means is made clear) if what you suggest by way of amendment differs as little as possible from what has already been written. Not only does this make it easier for the OP, but, in my experience, many of those who start threads react poorly - sometimes bristling with ill-temper - when advised to amend the thread title in order to clarify what they really mean.