Actually, I reckon you can buy love
If you paid someone to 'love' you (in the romantic sense, not the sex sense), then they could do the same things that someone who was genuinely in love with you would do. Buy you chocolates, go on romantic movies, be there when you need a shoulder to cry on, go on picnics etc etc.
From your perspective, if you can ignore the money aspect, what you see is effectively 'love' - pay enough money to get a good enough actor, and you would experience something indistinguishable from someone who genuinely loves you. In which case, what is the difference?
Therefore, you have used money to buy love.
As a case example: Anna Nicole Smith and her marriage to that old oil tycoon who recently died. I have no doubt Anna married for the money, but the old tycoon got what he wanted - someone to care and love him - which Anna did in her own way.