This surprises me as much as the author's usage did not. Are phrases like "bargaining chip" or "more than they bargained for" not common enough that this sense of "bargain" is widely understood?
For reference, there appear to be two definitions of bargain:
1.an agreement between two or more parties as to what each party will do for the other.
2. a thing bought or offered for sale more cheaply than is usual or expected.
I believe that the author actually does mean to use definition #2. One of the section headers in the article is "Bargain Shopping Careers." This certainly implies looking for GOOD deals not simply 'agreements.'
While I agree the first definition of bargain is also commonly understood, if you say 'seeking bargains' and all you mean is a that you are seeking agreements AND you are talking to someone who grew up in United States, I would advise you to just say "seeking agreements" otherwise the person will assume you are specifically looking for 'good deals' not simply agreements.
"Bargaining chip" is a bit more obvious, though. I admit, it does mean that, but I still think of it as a thing instead of 2 separate words. Right up until you pointed it out.
Even "you drive a hard bargain" comes through my head full of meaning, and I have to think about the word itself to realize it means that.
So a point of clarification: I've never heard the word used that way that wasn't part of a colloquial phrase.
The article discusses a way to define a Bargain.
> choose the available job option that offers the greatest variety of these traits in exchange for career capital
- wherein he defines both value and what you're paying for it.
I assume that by "career capital" he means the opportunity cost of working for one organisation over another.
"an agreement between two or more parties as to what each party will do for the other."
I've never, ever heard anyone use the word "bargain" in the way that the author is doing. I can't deny that it technically fits the definition, but if you want to be understand, I think it's important to use language the way other people use it.
The author repeated uses the word "traits" in the body of the text instead, and I think changing "Seek Bargains" to "Seek Traits" makes the title way more understandable.