It's a rare search that takes me to a page that mentions what I'm searching for exactly once.
Search result pages and destination pages serve completely different purposes, and you can't apply the same UI to both. If you ran a restaurant, you might decide to laminate the menus, but I hope you wouldn't laminate the entrees, too.
If you open first result - you can see how these keywords are highlighted. I'm pretty sure that this highlighting is a convenient feature for recruiters who want to quickly scan resume.
Ugh, you really need some basic formatting. I can't even see where one job ends and another one starts. And the contextless highlight doesn't make that any better.
You're right -- it takes time/effort, you know your business better than anyone to figure out if it's worth testing and optimizing. However, the lack of complaints shouldn't be construed as approval or desire.