Yes, you're right, I was pointing that, the excess of spam makes that worthless, maybe only the thank button for helpful posts.
'Thanks' will be misused much more than 'like' or '+1' and besides, situations to 'like' a post is more than to 'thank' a post. You may like a post but you don't want to thank the poster, such things are more in this forum. I still stand with '+1' or 'like' and not with 'thanks'.
-MZ