Games that change prices lower contribution level

At one point I bought two $39.99 games and gave them away here on the site. However their price was reduced to $10 so that my contribution level was lowered as well even though I sent both games before this price reduction. What do you guys think of this? Fair not fair? I don't really care about the credit or what not, it doesn't effect me too much I think it is an interesting thing to note.