First of all thank you for initiating this open discussion. This is my personal opinion, you may or may not agree with me. That's ok.

The initial purpose of bots is to assist the minnows to receive an extra boost so they have a chance to get notice. Most voting bid bot requires a minimum 0.1 so everyone can share the voting power of the bot, but some people wants more returns so they send more steem/sbd. If everybody think this way, surely the voting power value of the bot will produce a negative results, not what you're hoping for.

If you notice, some bots require a minimum of 2 STEEM/SBD or even higher so they can produce more revenue so they can pay their leased delegated SP to investors.

Bots are needed to help the minnows. My suggestion is to use a bot with a min 0.1 and max 1.0 STEEM/SBD vote bidding so everyone can share the voting power of the bot. Only allows vote bid from reputation lower than 50.

In this way, every minnows will be able to receive the pie they deserve.

I should create this project. :)