Fantastic post been trying to notice the same actually. I did notice on my last two my visibility went through the roof, but it's only above the 20SBD level and taking a -10% ROI at least SBD to use resteem bots as well and those bring no money obviously.
And yeah using bidbots is essentially only to mine SP.
RE: Testing... Testing... Is this thing even on? Week #3 (Vote bots vs resteems in the visibility category)