Depends. The most fair comparison in this case is the 4" Cobra's which go for about $30-$32 on Amazon. The 4" pliers wrench is about $42 on Amazon.
When you get into the standard 8"-10" Knipex, you'll quickly be in the $40-$60+ territory. For whatever reason Knipex prices vary widely. Pliers wrench can cost twice what Cobras do.
USA made Milwaukee are in the $35-$55 range. USA made Klein are in the range $30-$60 range. USA made Channellock are the most affordable around $30. Icon of course are $20, but not USA made.
Plenty of options... Personally, I go the Snap On route with a few Knipex.
Sure, Cobras and plier wrenches are fairly complicated, with pricing to match. But linemans, combination pliers, dikes, needle nose—what I consider to be “regular” pliers— they’re all around $20-40 from knipex or Klein. Even the Alligator knipex pliers, which are like the cobras but don’t have a push button mechanism, can be had for less than $30.
The only brand I know that routinely sells pliers for more than $50 is Snapon, and neophyte says they don’t own any Snapon…..@neophyte — please elaborate on your pliers with us, good sir