Linking to the cheapest wrenches you can find isn't really a great example to justify overly expensive wrenches. This is a deal sub-forum, so I'll always chime in when people waste money on items that far from deals, in an attempt to save them money. Most major tool brands are owned by the same few large corps, spit out by the same manufacturing machines that have existed for over 170+ years, by the same foreign metal from China, Japan, Canada, Mexico, etc... The only difference being that some machines are based in U.S. and not Taiwan, then sold as a *premium* brand.
The is an extremely simplified tool to manufacture. There's no special or expensive process to justify the prices of these wrenches. It's stamped metal spit out from a hot forging machine, all wrenches are manufactured the same. I know this will get many tool snobs going, but I firmly believe overly expensive tools are the Gucci, Apple, Louis Vuitton of the tool world. You're not getting any better quality over mid-tier tools like Kobalt, Husky, and even Harbor Freight other than the self-pride luxury of owning an expensive brand. If that's your thing, thing by all means go for it.