I agree. I guess somebody doesn't think his time isn't worth very much.
It's more than just soldering 4 little wires (and it's actually 5 so the OP just failed to do the job correctly himself) and it absolutely takes skill to solder "correctly". If not done correctly, the solder joint will be cold and then eventually break leaving the pickup not working. If not done correctly, too much heat can be applied frying a pot or switch. If not done correctly the iron could be left unattended without being in a proper stand which could lead to it falling on something that it would melt or worse, catch on fire.
There's also liability insurance for working on other people's guitars (IOW, not their property), the bench fee, in addition to the labor for the tech do to the work (removing strings, remove pickup, put new pickup in, make sure it works, restring, tune). It'll take more than 10 minutes, especially if there's any need to add in a toggle switch or swap a pot out for a push/pull.
Sure, we (meaning those of us who know how to solder correctly) may be able to do it in 10 minutes but that assumes just slacking the strings enough to pull the pickup or pickguard out and putting it back in like changing a tire for a NASCAR driver. In reality, it's not like that because of the first item mentioned in the last paragraph.
Anybody who thinks soldering takes no skill, stay away from my guitars, or anyone else's for that matter.