Messages or topics that we posts here are screened by moderators. If we posts something that is not related on the topics or is not useful, they might delete it. Thats why we must be very careful on what we are posting, and lets see it to that its constructive enough and is helpful to the readers.
Many factor post deleted, maybe wrong thread, post as spam, post out off topic, etc. So we must post good posting and earn some merit also.
If we can give solutions when people have a problem in thread I thing is very use useful post we made.
Keep doing the best post and good quality post, and sure your post not deleted.