The obvious disadvantage to this is that if you deserve 35% of the profit, there is no good reason why you shouldn't have 35% of the say. You have built in a system where someone gets to privilege their interests over yours.
Second of all, these shares are themselves going to be more difficult to market - you can't simply sell them as is as a tagalong to another deal.
Maybe you have a good reason to do this, but unless you can articulate to yourself a good reason to do this, don't.
Edit: That's a silly reason. Until you have outside investors, as founders, you will collectively control the company. Doing this will just make one of you dictator over the others. Such a structure is also going to be profoundly unattractive to equity investors. Anyone who wants to invest (other than your mother) is going to insist that you abandon such an arrangement.
Disclaimer: don't rely on anything someone said to you for free on the internet.