They get away with it due to their names being well known, and having histories of high quality. How many people have ever heard of 3Com having quality problems? Not too many, and they make a LOT of stuff, much of it high-volume, critical data type stuff, so the rationale is that they must have better quality products in all realms, therefore it's worth the higher cost. Lesser companies like Linksys and Netgear can't charge quite as much as 3Com, but they still have a known brand name to work with, and the lower cost allows them to get a somewhat higher volume than if they tried to price higher. The totally non-brandname cards HAVE to be cheap or nobody would buy them instead of a brand name card, but they're usually just as good. However with the no-name cards, you have to consider lack of technical support and driver support. I got some cheap 10 dollar cards, and the drivers are just the ones made by SiS for the chipset, the cards themselves don't even have a company name on them or anywhere on the box or mini-manual, but they work okay.