Kristen StewartReturns $40.60 for every $1 paid.Stewart performed an unusual feat this year: She topped our highest-paid actress list and almost ranked as the actress who offers the best return for her pay. Even though Stewart earned $25 million to appear in the last two Twilight films, she still offers a good return on investment.Robert PattinsonReturns $31.70 for every $1 paid.Pattinson is t…