I think overall it's easy to tell the difference, so I either do not vote it and just comment back with a simple "Thanks", or ignore them. Not everyone has a ton of time, so the comments one puts out there should be genuine ones if they are putting them out. Otherwise don't be a vote hog.. right? After a while I think we just get the feel for these things. You know.. You've been around the block a few times. hehe.
Speaking of which, I have to get over to your blog and see what abandoned, Tetanus and rodent infested abandoned buildings you have been visiting lately 😁