Slow but deliberate choice of parts based on performance, avaialability, and cost. All prices are accurate based on the time purchased.
I presume you brought that i7 over from another build then?
I got it for free off of a retired PC from my work . I was able to swap CPUs with the Dell machine, load windows 10 on an SSD and sell the Dell for $170. So technically the cost of my CPU was the original $220 for the i5 4590 minus the $175 and $55.
I just updated my prices given the info stated in my reply.