I used to have a custom built computer before I had to switch over to a gaming laptop, for reasons. In any case, I consider building that rig to be one of my greatest accomplishments. Sure it wasn't anything all too complicated, but it felt pretty great to be playing on something I put together myself. That and there is the financial aspect of it. By buying the individual parts and putting it together myself, it had more power and cost less than any pre-built gaming PC out there! It pays to learn how to put together the hardware.