In regard to the incentive for forging being securing one's investment, I strongly recommend adopting a "cold-forging" feature because the psychological fear of theft is huge when forging online.
There is a feature called Account Leasing.
You can give your account forging rights to another account, without giving up control of your coins.
So it's easy to lease your accounts forging power to a new account, and only use that account to forge online. This is effectively "cold-forging".