[advice] should I be upvoting my own content?

I notice that I can upvote my own comments...should I be upvoting them? Does it really matter if I do or dont?

Also, if I made a bot that auto upvotes each page that I'm on would that be considered useful or cheating? If it helps everyone in the aggregate earning power than I'm all for it. Let me know and I'll flesh out a tool (open source of course)