When you are a paid member the site operates as it should. People responding or engaging your profile in what i would consider a normal manner. Gender issues and money fishing not withstanding. Its when your subscription runs out that the nonsense starts.
Frequency of messages increases. From people that you have never once interacted with. When i was subscribed i would get two of three messages while online and a few expressions of interest. Nearly zero messages while offline. Now that i am no longer subscribed i can log in and expect 5 to 7 'messages' that magically appear. It is pretty obvious they have a script that randomly selects a few possible matches from active accounts that fit your search parameters and have them 'send' you intro messages that you cannot read until you're subscribed. Thankfully the ones i am getting are from profiles i am not interested in so no impulse to pay up to speak to someone who probably didnt even know they had 'contacted' me.