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"I've gotten scammed 2.50 for nothin!" I'm assuming the more you give the less you get! Not sure what I got though!"

Nice results :)

1 SBD = approx $10 at current exchange rates.

That is accurate and there are some random really large votes in there too!

Or purposeful downvoting of your enemies?

Javybar yes you are right, you have taken a good percentage.

I just gave this a shot with a $1.50SBD transfer. I got about $2.30 in return with @randowhale at 55% voting power. I wouldn't say it's a particularly good return.

The amount of voting power does not affect the return. I'd say any profit is a "good return" considering you're getting additional visibility you can't provide yourself. There are other bots out there as well, feel free to check them out.

You have a point. I don't buy votes very often but am using a couple of different voting bots for this post.