Is there a reason it takes 50 rep to comment? It seems kind of counter intuitive that I can answer a question but not comment. I have run into several threads where I feel as though I could add something by making a comment. A comment can be made to simply give the OP a suggestion on how to get more specific information in regards to their question. Or simply to help them rule out a possible cause.
Is there any reason the rep is so high for a comment? Is it because of spammers?