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that is right ... keeping 4 upvotes and up to 4 posts is good for steeming power, plus if you upvote a post that is going to gain much voting usually by whales then you are going to recieve fractional "plankton" and so on and forth...

Exactly, so do you agree that self voting is not a good idea?

if you plan to make 4 posts and upvote them 4 times then you wont have power to upvote others...balancing is key but if you have a lot of steem power you can treat yourself but then again you won't need it cause others will for you...up voting yourself is good for the new fishes ... it is like sticking your head up to get a peak or a pick lol ..after you become a big fish then it starts to stink but hey short answer...YES! it is a good idea :D

Do you think that is a good practice??

It depends on the account size. If the whales only self vote the distribution would be really bad, but outside of that I don't really have an opinion.