Steemit Payout Limit - Why upvote old posts? Is that someway right?

You need to read, the Steemit WhitePaper; I havent, but will definetly do! the "Payout Limit" is 24 hours, why I can upvote old posts? if that is not going to benefit the author?, because payout already passed?

This is a MUST READ STEEMIT code rules.

https://steem.io/SteemWhitePaper.pdf

I dont see any code, but will definetly read carefully!! Im new in cryptocurrency, but already invest in Bitcoin, Ethereum, Want to buy Eth and Dao, when the price is down "Hopefully", Steemit, is my recent Investment, **Well right now, just Time investment, but will definetly increase the power!

Thanks for the Support!
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Cheers From Central America's Promised Land!