As long as you are voting 2% or more, one larger account will similar results with a lot less effort. When you start voting below 2% (really 1.5-18% or so) the precision issues crop up which can cause you to waste voting power.
That should give you a solid 1,000 votes sustainably (your voting power won't drop lower than you can recharge in the day).
If you are doing more than 1,000 votes, yeah the multiple bots are the way to go.
The problem with a 2% vote from a large account is that you're limited to one vote per blog. This prevents new votes to trickle in. I want content creators to keep returning to their blogs to inspect their earnings.
Thanks @themarkymark for your technical perspective.
LOL! Thanks for the prescription doc.
Ahh, yes I see what you are doing. I'd have to agree then.