unless you're using the manufacturer date to sell these as "new" systems.
Or mostly new systems?
With that mentioned building computers (even ones with some used parts) is expensive.
I shudder to think how much money would be needed to build up a H61 Sandy Bridge Core i3 2130 when a new Acer Micro ATX pre-built with Core i5 7400, 8GB DDR4 2400, 1GB HDD, 300W PSU, Wondows 10 Home goes one sale for $400 shipped all the time.
Perhaps if there was a strong
purpose other than basic use computer I could see the extra time, energy and money being spent worth it....but I didn't see that mentioned in this thread.
P.S. Speaking of "basic use computer" one problem (edit: older) DIY has (vs. most (edit: older business) pre-builts) is lack of display port* for the iGPU. So that means when 4K monitors drop in price he would have to add a dGPU to just to use the monitor at 60 Hz.
*Desktop Haswell Core i3 and greater are required for 4K @ 60 GHz through a single display port. (Ivy Bridge is supposed to work if two display ports are present on both the PC and the monitor)