A couple of weeks ago a friend sent me this article from a mutual acquaintance at CCP. It's all about the continuous struggle that the MMO guys have keeping their in-game economies balanced amongst all the real-world trading of items and game currency.
I was particularly interested in the stats near the end - in a crackdown on gold farming they managed to drop CPU utilisation 30% through a 2% drop in players (banned accounts who were violating these terms). To paraphrase that; 2% of the player base [revenues] were creating 30% of the load [costs] and that my friends, is what I call unprofitable usage of a product.
When you read that last sentence it makes perfect sense, however so few of us on the web think this way. How often have you looked up your top workload creators (page impressions, transactions) and your top revenue creators (purchasers, subscribers) and compared the two? How sure are you that your costliest customers - that you are probably supporting a collection of CPUs to service - are not marginal or worse in terms of value to your organisation? With sites more data rich than ever (read: more back end work per view) and screen-scraping a more widespread way to acquire content it's worth working to discourage this behaviour or at least make conscious decisions to allow it.
This thinking should be taken all the way back to product design - on the web we tend to emphasise users/visitor/subscribers without really thinking through what constitutes profitable usage.
It's not just about nailing people who are out to exploit you either - as a long time data provider my biggest issues have usually been well-meaning customers with lazy integrations. If you're going to build a client on top of a web API it's quick and easy to poll the bejesus out of it round the clock and then react to data in the responses rather than, for example, get a schedule of 'interesting' data and dynamically set up threads pick up smaller changes to discreet items on separate and appropriate timers. Take trades for example; why hammer a Hang Seng Index Options feed after 4:15pm? Or how about our feed - do you need 5 prices a second for this weekend's football fixtures on Tuesday or would hourly pre-match odds and squad changes be more than sufficient that far out? A slightly trickier initial integration but a better and cheaper product (for both parties) thereafter.
And finally I've always found it more effective to encourage good behaviour than discourage bad behaviour. Sometimes this can be as simple as an SLA which guarantees a superb latency up to a certain number of requests and creeps out in bands beyond that. Other times this can be purely commercial - why not extend better pricing to customers who genuinely cost you less to service or a tiered revenue share to those who contribute more to the partnership?
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