One 100% upvote is 10% of your voting power per day. I agree with this for large SP holders. Minnows voting percentages don't matter too much unless they are trying to prove themselves a good candidate for delegation. I think somebody getting delegated to for a lower price than they get from curation should vote less than 5% for themselves. (I haven't been very responsible about this myself lately but I plan on holding myself more accountable.) That would mean 50% of one full upvote per day. The reason I think a delegate profiting from curation rewards should vote less for themselves than the owner is because there is less incentive for them to be responsible since they are not invested themselves, and so they need to be held more accountable than a whale who potentially loses capital value by abusing the system.