Personally, i would be more inclined to pay for the subscription, then you are more likely to meet s/one decent. (Plus you would know if they are 'tight as a duck's rear-end!!')
I just think it's more likely that the people are more serious if theyre willing to pay the subscription, rather than just 'on a free website chatting up the birds?'
I think i would feel safer knowing they had paid for the privilege of chatting to me and/or other women. Maybe it's just me but i'm very wary.