Overselling is a big trend in the web-hosting world at the moment. It’s an easy way to get more out of your servers than normally is possible. The basic idea of overselling is that the majority of your clients are only going to use a fraction of the resources allocated to them so there’s going to be a lot of wasted bandwidth and space. Overselling involves taking a gamble and selling more than you can handle assuming that the unused resources will cover it.

The advantage of overselling for the host is that they make more money off each server than they otherwise normally would be able to. The advantage for the client is that this extra revenue is usually transferred on (at least in theory) by cheaper hosting packages with more features. The problem is that these features are often ‘smoke and mirrors’. A few users would be able to use their entire allotment without any trouble, but if every single client were to build their website up to maximum capacity the host wouldn’t be able to handle the sudden increase in demand without adding extra hard drives, buying more bandwidth, or perhaps even another server. This would most likely lead to a fair amount of downtime.

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