For everyone who feels they must be thanked every time they are helpful to someone, keep in mind that the person has to have a minimum of 25 post to have a "Thanks" button.
This is about the fifth time I have seen this today alone.
When you get to 25 post, you will see a "Thanks" button at each post. When you feel someone has been helpful to you or has posted something very helpful, it is customary to give that person a Thanks. You will see each person has a given thanks total as well as a received thanks total.