As far as I know the bonus amount for referals only applies to those directly recruited (ie one level down).
Therefore, the main account (the one with 10 BTC) will be earning a bonus to the account above (with virtually nothing in it).
I agree that this method will mean that your higher level accounts will complete quicker (but when they are complete the bonus is kicked further up), so I do not see the benefit of this.
I would need to work through some more examples before I could agree or disagree though!
But the reason people advertise referral links as giving a 10% bonus and have them actually get clicked is because the bonus goes to the user who uses the link. Of course, the referrer gets a bonus too, hence the incentive to post them; however, the size of this bonus depends on how much BTC the referred user deposits. I don't think it could realistically work any other way.