LOL, LOL, because it can also go 10% up overnight, LOL, Because i wanna....
I hope you are not the NXT PR guy...
))Anyway, "because it can also go 10% up overnight" - in this case, the customer will have to pay 10% more for a song that can be bought for 10% less using a credit card in less than 2 minutes. It doesn't matter where the price is going. The artist will have to update the prices, 1 item / minute. In case the merchant doesn't update the prices fast, those are the options :
1. The merchant looses money.
2. The merchant has zero sales.
LOL
Of course I AM NOT the NXT PR guy, I am just an strict individual that answers blatant trolls like you the way they deserve.
The problem I see here is that you are actually the "PR, dev and everything" guy of MaskCoin and MaskNetwork which is one of the most obvious scams of the announcement section of this forum. Totally shameless of you.
RED ? Where 
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LOL Spoetnik, you are an idol.