umm...personally i found the fares on the site to be pretty competitive...in fact as far as i know those are the recommended selling prices for the agents to passengers...sometimes smaller agents (at least in HKG) might decide to earn a smaller profit and sell at below this price...but since i usually buy from our corporate travel agent (even for leisure), because of convenience...and they usually do not compete too much on price, so i found the fares on cx.com actually to be pretty competitive...
i usually don't want to go to other agents, because sometimes i found it not too worthwhile to call say 4-5 agents just to get a quote which is maybe only hk$100 or so cheaper...and sometimes may even need me to go there to pick up the ticket, to pay extra 2-3% to use credit card, etc...while doing it online i usually get the ticket courier'ed to me latest by the next day, if i decide to get a physical ticket and not e-ticket...
btw, i am taking about the situation in HKG...in other countries there might be more consolidators and thus much lower fares, but i guess the fares aren't really that different for ex-HKG tickets, from different agents vs. from cx.com ??