I've invested 10.5USD (3x3.5USD for 3SBD) and I got 7.05$ minus 25% for curators = 5.29$. It means 2.64SBD (2.64SBD*3.5=9.25USD) + 2.64USD (in STEEM POWER) => 11.89USD vs. I've invested 10.5USD. My profit around 1USD...not so good, but obviously it's attracted viewer as I can see number of views.
RE: Upvoting bots – good investment?!