Make your money going in?

[Timothy Johnson]

I am curious as to wether you guys agree with the idea that an RE investor should only take on investments in which he/she will make their money going in. IE buying RE considerably under market value. Of course this is probably required if your interest is flipping but what about those who want to buy, hold, and rent? Because technically one could purchase a REI at market value and still make money through renting ect. Is "making your money going in" a requirement for those of us who want to rent out with a long term goal in mind?

Thanks!