The level of sp is not important.
Even if you have just 50 sp, and you want to delegate 10sp to a friend struggling to have enough steem activity for a day, that is already a good boost.
Delegating sp to somebody is already a norm in the steem community.
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Yes but I am talking about delegating properly to someone and not daily delegating. You need to be large enough to help properly. I have seen accounts with 2000 SP delegating more than half and that would have an impact on your growth. If you have 5000 SP as your base then you would grow quickly and be able to delegate more. Just on curation monthly you could get close to 100 SP just by holding at that level and helping others. By being stronger you can achieve much more and that makes more sense to me.