What? No.
As brian said, the price of the steempower is the advertisement costs.
And that 1,000,000 SP is still in the system (even when pulling 'income' out...and some of that income would stay in the system to increase the SP count...and there are other benefits involved that are good for steem, like the upvotes to others, the delegated steem to curator groups, etc.
Yes the original investment can be pulled out after 3 months, but that's three months it's still in the system...and pulling out the original investment can lower the price (thus one gets less back) of steem, which incentivizes the investor to keep it in and use it, which supports the platform.
Steem needs investors and people that want to profit, because they drive innovation and new users to the platform.
I notice that people don't like anybody profiting from steem, but if it's not a profitabe platform/business, then it will die, and the people that will be sad/mad are the ones (partly) responsible for killing that which gave life/growth to the platform.
The more users, the more profits available, the more steem price rises, which creates more users and more investors/participants, which creates higher demand for and interest in the rising price of steem, which.....
So you are saying any Steem I buy will be worth less in 3 months, because i leave some of this income in the system
Having just reread what I wrote, I don't think I said anything about that at all.
I was basically saying that more users and more demand increases the price of steem, and that the growth of steemit.com depends on that, and that requires ability for users to be profitable.
But responding to just your question, if you leave your steem as steem yes it gets less valuable. It keeps up with inflation when kept as steem power.