It is not wise to invest all your profit and start up. This is because most times most weeks can be involved in your business so you don't know when Rick's we arrived so you have to have some money left.It is very advisable to re invest your profit as a startup because your business is still in the growth stage. Growing Businesses needs all the money it can get to fund the day to day activities of the business and to ensure proper penetration in the market . Re investing your profit in your own business is just like giving food or energy to your own body. You will only gain from it.