You could have you bot upvote, then remove its vote, and monitor from another browser whether the score changes. Having the number be fuzzed makes it harder to confirm if your bot has been caught and it's votes discarded.
Fuzzing the votes like this is cheap for reddit, but makes it more expensive for the spammer.
The best spam-filter is tricked by a hand-crafted, personalized email that is well-targeted. However, the cost of these are insane compared to mailing the same thing to hundrets or thousands of users. So anything any spam-filter ever does is making spamming less lucrative for the spammer, and fuzzing does that.
But you're multiplying it by some number for every single comment/reply. Spammers work through large numbers... make each one a little bit harder, and it adds up.
