GFCI and grounding electrical outlets on a 1980 house

[Edita D.]

Hey guys!
We are considering a house purchase, and inspector recommended the following:
**Ground the electrical outlets in the bedrooms
**Install GFCI's in the kitchen, baths, and outdoor outlets.

The seller does not want to do it since "the house was built in 1980 and it was built up to code back then".
I was thinking about getting a quote how much this would cost and deduct it from the purchase price... What do you think?

Also, I do not have much knowledge in electrician's field, and I was wondering if this is important at all?
Thanks :)