Contribute to our ICO and get a 📦 MYSTERY BOX! 📦

[raymondspeaks]

You'd have to be careful with this in my opinion. You run the risk of a lot of people joining for the mystery box and then dumping their coins right afterwards. The downfall of running any sort of bounty program is plastic investors.

Unless all you need is the money to start developing and then later what you bring out will heavily influence a market trend upwards

[AltcoinTradingSignal.com]

I strongly think that it is not going to work. Yes, you can add it, but don't expect investors to invest just because of it. The mystery box can be a great add-on and will incentivize positive behavior towards your behavior, not start it.