It is not uncommon for folks to be put off at the idea of upgrading power cords… even when interconnects proved to impart a significant improvement to the sound. The problem is that very often if you simply make a low ball purchase you will not get an improvement. I have a number of cheap name brand low end (~$100… like Shunyata) that I bought for a work system that had relatively low end components in it. They did nothing. For fun I tried them in my high end main system… and they were no better than the stock power cords. @allears4u you were very lucky.
There is no question that the effect is component / system dependent. However if someone wants to see if they can improve their sound with a power cord they should start with one for the amp and try a cord somewhere in the vicinity of 10% the value of the component. This gives a very high probability of making a significant difference.
High end systems are built component by component, interconnect by interconnect, PC by PC, acoustic treatments, etc. it is all additive. To get the very most out of a carefully assembled system, using all the tools is required. Power cords are definitely one of them.