But this explanation and perhaps a link to something similar (or other helpful details) could've just been included in the main post, and the doubts avoided. Like @preparedwombat said " your as clear as MUD". My two cents
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When someone sends @booster SBD for a %upvote, they get people from this Curation Guild that also upvote their post. Transferring SBD to @booster not only gets your his upvote but also some upvotes from this curation guild. It would be the same if you upvoted yourself but it is done automatically for you (that's why they need your private posting key). When the posts that they upvoted for you automatically with your private key are cashed out, you get curation rewards.