I've found PCs make the most difference at either end of the system. Sources or amps.
All devices can be enhanced or improved of course, but the more noteable changes 'best bang' comes at each end. Size of the cord's conductors too can make one better or worse a choice for various items, so some attention to making a good pick as always is important. Cost effectiveness might also be an astute consideration.
If a $70 PC gets you there... that's super. Wish I had been so lucky.
So far my exp has shown me that the more money I've put into a PC the more noteable the change or difference. Sometimes the change is seen as an improvement. Sometimes it really isn't a complete 100% improvement. Sometimes it's a mixed bag. Everything was enhanced by better rewsolution, yet the stage was set more forward, or more away from the LP. Sometimes a blacker background was about the only noticed change.
I've found too, IMHO, some PCs work best with some brands of IC s, better than some others.
it's an interesting proposition for sure but I'd suggest you try out a few brands & models to see what fits best and where, for yourself and your own gear.
Lastly, Whenever I have introduced a PC onto an upstream component, that PCs influence is felt/heard throughout the balance of the gear, as with PLC supply cords.