Yea according to this other post I read, the opposite of this bot's strategy was recommended for curating articles manually:
https://steemit.com/curation/@liberosist/mind-your-votes-ii-a-guide-to-maximizing-your-curation-rewards
May be different for bots although I imagine that if the bot has a high success rate with comments upvoted for (I assume this means further upvotes by other users), then it might make sense to vote less often to preserve voting power.