It shouldn't matter. I'm not saying it has to be $500 bucks logo but it certainly can look like a $25 work where's it looks like something you can get with free logo designer. People who freelance at 99designs.com usually design first & get paid only if their design is picked still the quality there is brilliant. We don't even get to pick the design on BB.
Besides, I'm not sure if Brandbucket designers provide any PSD/AI/PSD/EPS files when they gets the full amount. In that case, the new buyer needs to spend on logo again.
I'm not saying Brandbucket is bad but I do think it can be lot better experience for both party with some changes.