If you use these sites and get the £9.99p type offers pay using Paypal you can then go into your Paypal account and cancel the automatic renewal straight away then after 24hrs you should also cancel the auto renewal via the sites subscription page, nothing to lose as will be able to use the site until membership expires and they will send you another offer. These companies rely on members forgetting to cancel their auto renewals
My experience is that a lot of people have not logged into the site for over a month which indicates they are not active and they seem to have very few members. I searched for ladies within a 50mile radius non smokers btwn 43-54 white and I think out of the 10 pages of results only seven had logged in <<< less than a month. I certainly wouldn't take out a 6/12 mth subscription, I just have a £10 punt every few months and I make sure I cancel the auto renewal on Paypal straight away.