This is something that recurs every once in a while, and there may be no real answer for it. I am noticing more posts with a request to the OP to click solution. (I am NOT pointing fingers) There is a need to have the solutions marked, if tastefully possible, so that the solution shows in a search.
Having said that, when I do a search, knowing that not all solutions are clicked, I read them all that pertain to the problem I am researching. Often the answer is in an unclicked post. So, I have to ask myself how important clicking solution is in the general scheme of things.
If all threads were solved, it also serves little purpose as, often as not, the OP clicks his/her own post whether it was the solution or not, or later says that it didn't work after all.
Another problem is that if four helpers are all posting on a thread and asking for the solution, how does that look to the OP? Since the kudo count and the solutions count are included in the ranking stats it does tend to encourage "fishing for compliments."
What I found slightly more tasteful (and again, I just may be old school) was for some other unrelated person to view the posts and if called for, recommend that the OP choose the post most helpful and click solution.
Any thoghts on the matter?