jelly - just to throw my two cents in - as a man we're expected, generally, to initiate conversations. However, it's brutal out there - if I send a message to twenty women I find attractive, each one is well thought out and based upon what they've written in their profile. I try to be amusing if possible.
And then.. tumbleweed. The majority of the women on match aren't actually signed up to read messages, and some of those that are take a look at my profile and don't reply.
So rather than spend my time writing a message which will probably never be read, I may just wink first of all to check if they're actually interested in reading a message. Then if they wink back I'll message.
It's not lazy to wink, particularly. It's just avoiding repeatedly shouting into the abyss. I'd think of responding to those you like.