One of the problems of using bidbots is the fact that you can't actually get a positive ROI. Remember that ROI is return on investment and is always related to what you could make if you invested differently. The only real investment on Steemit that will return a positive ROI is to put your SBD and Steem into SteemPower.

This is because you continual make more and more curation with the higher SteemPower. 1.oo SBD to 2.74 up vote curation value doesn't add up to a positive ROI because if you had invested that same value into your steem power overtime your return for that same value will be much greater than 2.74 curation. If you sell it to another steemian for any reason they will get the return on that value.