Yes has happened when I used Grindr. People want to meet someone, get to know them, and then they have lied. Usually it tells about their insecurities, or they just want to have you and try to say the "right" things. For some it seems to be no big deal, which for me tells enough.
Very much so! I've run into guys that seem to use pics for profiles that were taken 5 or so years before and they have changed, or just totally used someone else's picture.
I went to meet a guy earlier this summer who looked great in his profile pics, had a nice profile that was of interest to me, so I sent him a message. We had a lot in common socially, and rather than just run to hook up we took a few days messaging since our schedules weren't syncing up to get together.
When the day came to go out to meet, it took me a good 45min in stop and go traffic to get to his place. When I rang the doorbell and he answered, I was immediately turned off, and refused to go any father. Rather than being the "toned, athletic, tanned" guy he said he was in his profile with the "George Clooney" face, he had to be about 80 pounds over what he said, had a serious beer belly going, and looked like he hadn't showered in a few days.
When I said "What the hell, man", he said the pics were from a few years ago, though the cock and ass pics that he had sent WERE from the past week. Well, I wasn't about to find out. So he got the speech from me, and I turned around and left and had a pissed off drive back home. I'd rather he had been who he said he was and just had bad sex.
But that is a problem with it, but one that I know about and expect a small percentage of time. For the most part, guys look a ton better in person than they do in their pics. I've thought about having professional pics done and use them so I KNOW I look good in them.
For me its just one of those things. I always save my "right to refuse" for when I actually meet a person and get to check them out. I've turned down more than one person after meeting, and I'm sure there will be more. It's just one of those things about internet hook ups.
At lease when I go to an adult store for glory holes, or to a bath house I get to see right up front what is available and who I'm going to go chase, or let chase me.