The idea behind Stumbleupon (and all similar sites, such as Digg, Reddit, etc.) is that you should only be stumbling sites that you actually like or that have some sort of value (in their respective categories) for people who will then see those sites as a result of your vote.
Also, I want to point out that a lot of the people in this thread seem to have the impression that you just stumble a "site," which you can do, but you can and should also stumble individual pages on those sites.
Any bloggers on this thread will attest to the fact that when a good post of theirs goes viral, all of that traffic is going to that one page, not scattered all over the entire website.
So, the idea behind people stumbling other people's sites or individual pages is not to "game" the system, as that will just dilute it for everyone and ultimately make Stumbleupon lose its value. However, getting together a group of people who want to help each other on Stumbleupon in order to vote on quality and useful content is a great idea, and that idea can be extended to Digg and the other sites as well.
I am a member of a small (but growing) group who work from these principles, so if you would like more information on that, just shoot me a message or send me an email. My contact information is all over my website.
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