Hi @vysmek,
I can´t tell you exactly how much Dividends you´ll be able to receive in the end.
It basically all depends on how many people will use the Project Steem Upvote Bot in future.

But let´s make a rough calculation. Let´s say 2500 SP are Invested by 25 People, so that everyone contributed 100SP. With this amount of SP the Project should be able to handle a maximum of 20 Votes a day on a profitable Basis. This would lead to roughly 50 SBD flowing in a month. So you´d receive 0.5 SBD as a Dividend in the end.

But even more important, your Investment would have created a total Donation of 1.5 SBD at the same time. Project Steem is meant to support Charity and the Community with some profit for everyone. It´s not meant to get maximum profits though...