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Savings is just a security feature, about allowing you to have time to deal with your account if it gets hacked. SBD/HBD has had an interest rate since launch, before the savings feature was created. Witnesses set it to 0 after SBD became overvalued, and most of them never touched it again after.

Savings is just a security feature...

For now tm... things might change ;)

Nope, you just have to hold it. The idea of using the savings account in order to accrue interest is just that...an idea that has been suggested by several people.