Surely it's just a title, to summarise what's to follow in the body of the question, and it's not neccesarilly best to phrase it in question format. Also, I sometimes have a question in the title followed by a clarifying note (often in parentheses), which isn't a question, yet I need to add a question mark to post it. I think it would be better if the title could be a statement or a question, or at least if there could be a statement after the question (that is they could require a question mark, but not require that it be at the end).
- Good ideaVote A
- Bad ideaVote B
- Who gives a stuff, just put a question mark on the end anyway! ?Vote C
- No idea / see answersVote D
Most Helpful Girl
Because questions end in a question mark.
"Mainly interested in girls opinions, but guys feel free to comment."
That really shouldn't be a title. It's more like something you'd put in a postscript, as it doesn't give any idea or at least intrigue the readers on what the topic would be about like a good title should.
It's already understood that you're asking because you're interested in hearing their opinions, so you really don't have to tell them that. It’s pointless. Instead, you ask them what exactly you are interested in hearing their opinions on.
Also, English is a very versatile language, so you can make just about any sentence into a question. And if you were purposely trying to be vague, then there are numerous ways in which you could have said it: “What do you think about this?”, “Do you have any thoughts regarding this matter?”, “Could you give me your opinions on this?”, etc.0