As a few have already mentioned but most have missed - Quidco make lot more than just the £5 member fee. They only pass on some of the commission to customers; the rest they keep themselves.
My girl friend started using it a couple of years ago and has made about £1k back.
Some highlights being - £70 back for switching to a cheaper Gas and Electricity supplier, £100 back for our Car Insurance (it was also a cheap deal), 10% back on our new TV last year and 10% back from the hotels on our trip to Miami and Key West.
Why choose Quidco
* 100% cashback – we fund Quidco with an annual £5 fee from your cashback
We pay 100% of this commission into your bank account
How do Topcashback earn their money?
Does TCB have all of Quidco's merchants?
Yes, and a few more, Quidco had a disagreement with one of the affiliate networks and lost some of their merchants.
I don't get the quidco topcashback preference thing,
Prefer topcashback, no £5 fee. Similar rates and they track just as well as Quidco.
how long does it usually take for mobile contracts to pay out through quidco ?
How does the tracking on these sites work anyway?