If you jump into the middle of that arrangement for your own accounts, Maybelline has no way of pre-screening you. It's also likely that if Maybelline got wind of what you were trying to do, it could bring a lawsuit against you to disgorge your profits.
In addition, some companies that work on a wholesale distribution model (and not just a network marketing model) provide their distributors with an exclusive territory. If you were to buy the products from your next-door neighbor and sell to your own accounts, you could well be undercutting his/her rights to sell exclusively in the territory . . . which will not make for a happy and harmonious neighborhood.