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Yes, go ahead

Why upvote from steemians who are high level in lessen jumblah percent. What a loss for him to give 100 percent upvote

It's all about voting power. Most people try to conserve it as you can only recharge 20% of your voting power in a 24 hour period.

Also people do give out 100% votes but it usually has to be exceptional content

To put it more simply, if you vote with less than 100% you can spread more votes around

You will find a lot of useful information in the steemit FAQs

https://steemit.com/faq.html#What_is_my_voting_power