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Yes, the more you send the larger the vote will be. Sorry, I thought that goes without saying here.

so its not random anymore? , what return do you you get on a purchase?

It used to be random. And you did not post the value of the vote. So buying the service now is kinda random.

You can use steamworld.org to see the value of the vote. Just put your username after the URL. i.e. : steamworld.org/@UserName

I meant rando's vote. If I pay 0.5 SBD, that means I'll get a 5% vote or what? and for each amount what it is

I can't tell you want will will happen in the future. I tested this service out with .5 SBD. I got 1.6 back. Since that usually works about to about 1/3 SBD and 2/3 SP, I got back more than I put in.