Contributions change with the steam store price- Discussion/Suggestion

Ok, I just realized today that the amount of your contributions changes according to the steam store price (i.e. is dynamic). I was surprised because it doesn't make sense to me, in the sense that: Imagine someone buys a game at full price at a certain date (for the sake of argument, let us use the example of Skyrim bought at initial release). The person pays $60 for the game and gives it away here. According to this system, the contribution of the person is reduced, say in 1 years time, to whatever the new price of the game is (let us say $30, again for the sake of argument). Does this sound fair to you?

To make my example and what I am trying to argue a little more clearer, let us say that you gave away 10 games that were recently released at $50 each. For the sake of argument, I am going to exaggerate the diminishing value of the games here; let us say that all of the games you gave away at $50 are suddenly reduced in price to $10... note that this is a reduction in list price and not a sale. SG system reduced your contributions to $100 from the $500 that you paid a day before. Obviously such changes are not going to occur overnight but over a period of 1-2 years depending on how well the game holds on the market, however it doesn't change the fact that you paid $500 which now look like $100 on the site... $500 that you spent (which could have gained interest in a bank savings account and be more at this future date) is now worth less on SG...

I think the value of contributions should be static and based on the value of the games at the time it was given away. This way we will not be diminishing the value of the contributions made by the generous people on the site and at the same time newer contributions can be based on the value of the game at the time of the giveaway.