The motherboard is already installed in the barebone system relieving you of the tedious
and time consuming task of installing it. Installing a motherboard is difficult for the
novice and quite often results in a burnt cpu or motherboard. Even experts prefer barebone
systems because it saves them the time and hassle of installing a motherboard.
You can customize your bare bone system. Buy the barebone system and then select the CPU
and other peripherals of your choice.
Barebone computers save you money. Try salvaging as much as you can from your old PC.
Usually it is cheaper to upgrade your existing PC than buying a completely new system.