I can't agree with You this time.
I buy since 2001 online, directly by the airliner or in a few websites online in Italy When I bought the tickets from a website I always had minimum Euro 20 discount, if not I do not even start with it.
Two years ago I bought a return ticket only 3 days before departure MUC-DOH-BKK for Euro 408 on a website, the same flight Qatar was selling at Euro 678. This was the best deal ever. I don't intend to list all of the flights now.
Last week I had people from Sudan visiting me and they were complaining about the expensive fares they paid. More then $ 1400 per person, I found the same flight for $ 334 on Trabber.com.
Trabber.com isn't selling You anything, they only search for the cheapest fare in that particular moment and they show You the website where You can purchage it.
You try it out, make a request, doesn't cost You anything.
By the way, You don't always need to pay with credit card. Lots of sites accept Paypal and even a banktransfers.
Edited: 7:20 am, January 29, 2013