Actually, the bottom limit was put in place because if you have too little sp, and try to vote at a low percentage, it will cause errors in the blockchain.
Even if it was put in place to prevent spam, it's a violation of the Steemit Terms of Service to circumvent the code to gain access to a feature you're not supposed to have.
take it easy:)
It will not cause any critical error. Also, My posts are not very popular.
anyway, If you want, I can remove that code :) but I don't designed this.