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I only say that because I tried powering down for one week and my MVests, as seen on Steemd.com went down by 0.1, I believe that number dictates the acruement rate of steem power to your account.

I'll watch this and see what happens each week, but thanks again.

He is right. Powering dow has to do with vests.
You are losing the same value of vest at every time. The more steems are just inflation.
So in the end you might be with 1 vest and its value to be 1000 steem. You will get your last payout of 1000 steem.
Also as far I understood by reading the white paper after every few years steem amount will get halved.