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You can check @lavater delegations, he delegated to 7 bidbots with all same SP, and you can use this site to compare ROI https://www.steemdesk.com

Yup, Im doing it :) nasty boomerang, no negative ROI limit for vote buyers :s

For informational purpose: @tipu profit for 32000 SP

Yesterday 32000.0 STEEM POWER delegated or invested gave payout of:
25.237 SBD + 2.512 STEEM (44.15 USD), APR: 23.17% .

Delegation link: steemconnect - 32000.0 SP delegation to @tipu.

Please note the profit depends on STEEM price. The higher the STEEM price, the more SBD profit is being generated.