A friend of mine conducted an experiment just for his own entertainment where he used two different pictures of himself on an internet dating site. One pretty old pic where he was out of shape, not absolutely grotesque, but where he had a bit of a belly on him, he looked like a contestant on that old reality show Average Joe. One newer pic where he was in shape. But, it was obvious that it was the exact same guy.
Now, with the first profile, he would message girls, actually read their profiles, and try to engage them in conversation on their interests, and try to start actual conversations with them, and he got NOTHING in return.
The second profile, he would just say "hey" to the exact same girls that he did with the first profile, and the vast majority replied to him. The ironic thing being, a fair few of them actually had on their profiles "Don't just say "Hey" and nothing else, try to actually get my attention and show you can hold a conversation".
It seemed like a huge waste of time, but when he told me about it, it was quite interesting hearing about it.