Not only does it help others to find solutions, it also is a very good way to reward the people who put in the time and effort to contribute to this forum.
For those of us who truly are here to help others and care whether or not an issue is fixed, it's good to know that the issue has been resolved. Otherwise several possible solutions are posted and the people trying to help never know if a solution was reached. Personally I like to know when an issue is resolved, so I no longer spend time trying to help with an issue that has already been fixed.