If I correctly understood the latest news, all the holders of the tokens QSP, will receive a reward for the audit that takes Quantstamp to his management?
Correct. When a client uses their auditing service, they will distribute an airdrop of the client's new token to QSP holders. That's what will drive the price up. Imagine getting one or more airdrop(s) a month from projects with serious backing...that what will happen here. Shitcoin ICOs will not have the budget to use this service, so you can guarantee that the clients will be serious players.
They are backed by the likes of LDJ Capital, that has worked on over 40 ICOs alone. If you don't think there's a market for this, do a little research. There have been several high-profile ICOs screwed up due to contract coding errors/security flaws.
Deposit some QSP into your Ethereum/Mist/MEW wallet and sit back and let the new tokens roll in. It's a no brainer.