I know the concept and it is definitely fun to read about it every time there's a new masterpiece of journalism around airline pricing.
I can assure you that this can't be done with the vast majority of pricing engines around and it is most likely not implemented on any of the major full service carrier website.
There are ways to add charges on the front end but it's a very risky business.
Agreed - it's one of those things where the conspiracy sounds more sexy (and believable if you don't know what happens behind the curtain) than reality!