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That can happen - But of course It can also ROI much more than that. @Booster is completely auction based so if there is someone spending a lot in one window, he may take a very large per cent of the total vote. The same happens if there are too little users, So you can be maximum lucky or maximum unlucky - it all depends on the market as @Booster has no min/max ROI. We see users making super ROI every week, especially during Saturday's and Sundays when it is bedtime in North America.