If all you have to power is a monitor, that would be one approach assuming you have a power supply with an auxilary power connector.
Couple of reasons why most end up using a strip or some other method of multiple outlets....
a. most ATX power supplies with auxilary power connectors are "always hot" meaning, they are always on even when power to the motherboard is not
b. there are often situations where you need to power something more than just the pc and monitor, ie: marquee light, speakers, etc