You can withdraw 5 MNX at most. The parking will remain active as long as your wallet holds more than, or exactly, 15 MNX. What matters is the balance of your wallet, it should not go below the total parked amount.

Yes I understand that, my worst case scenario is "what if the price is really high and starts going down". Those in control of minexbank could use their "power" (their influence on the market through the interest rates) to somehow control the market and make the highest profit possible. How can we differenciate a legit change of interest rates that aims at keeping the volatility low, and a change that would mainly benefit the MNX creators by market control?
The "only blackbox" in the minex ecosystem is the algorithm that is(or will be) used to decide the interest rate. And any blackbox can be used fraudulently, no?

Maybe some safeguard were given in the white paper and I missed them?


EDIT:
I should be more accurate about my worst case scenario. When I speak of a high value that starts going down, I imply that the price is going down for a legit reason (a flaw in the code, many exchanges that, for no reason, decide not to trade MNX anymore, anything that would hurt MNX in the long term so that we are in a position where almost all MNX holders will want to sell and limit damages). What I fear is that those behind Minexbank use interest rates to delay (for one day? one week?) the moment where many will sell their MNX on a trading platform. The minex creators would have a significant advantage as they would be the first ones to sell their own MNX before the price goes down significantly.
Such a scenario is highly unlikely, I just wonder whether some safeguards were put in place to ensure minexbank will only be used for its purpose and not fraudulently, just that.

I rather think that central banks and crypto "shouldn't" live under the same roof, but MNX and minexbank show that they can.
Well, Minexbank aims only at keeping low volatility and a fixed increase rate in MNX/USD change value, it misses one key mission of central banks that is creating new coins, so MinexBank is not strictly speaking an actual central bank.

My only concern about Minexbank is when they declare on their website "First Trustless Bank". Ok I do not need to trust them by sending them my coins, we are far from the Ponzi scheme of Bitconnect here. But I still need to trust the fact that if I park my coins, I will indeed receive a "reward" for that. And that the minexbank reserves will only be used to reach the official goals of minexcoin (low volatilty mainly). For now, I think all payouts were indeed fulfilled, but what ensures me that it will always be the case?
Let's assume that one day MNX reaches really high value, starts to lose its value significantly (like we saw the last few days) and that the team behind minexbank is actually a group of scammer that will try to get the most money possible while they can, their strategy could be:
1- Prevent people from selling their MNX by showing really high parking rates on minexbank
2- Sell their own MNX
3- Stop paying parking interests to most minexcoin holders but themselves
I read the white paper and the memorandum, but did not found anything that makes this scenario impossible, did I missed something?

I want to insist on the fact that I started investing in cryptos a month ago, I hold bitcoin, Litecoin and Minexcoin and I do believe that minexcoin has a bright future. I'm not a FUDer, and I hope my post will not prevent anyone from buying MNX and will make the price rise up again.

The only thing that would make me stop having MNX would be the creation of a similar coin, where the role of Minexbank would be somehow distributed between miners. For instance, to park my coin I would have to send a signed message on the blockchain saying that I will keep a certain amount of MNX on my wallet for 7 days and I would claim my reward after this delay by sending an other message, then my reward would be send to me in the next block. The algorithm to choose the next parking rates would also need to be distributed among miners... Until the emergence of such a coin, I stay on board with minexcoin!...