"Imagine that you're talking to person with basic knowledge of blockchain...." Here I stopped thinking about the answer :P
But let's say you can present delegators as small investors. But with small daily payouts (depending on the volume of delegated money) without an ending date and with their right to withdraw money whenever they wish to.
reasons why investors would like to proceed with delegations? I delegate. Reason: Mostly because I am not so active on Steemit so that I could use up all SP.....oh damn... I can not tell this to new guy, sorry :P