We are offering 120% Bonus on LISK deposits for first 24h so that alone should be a motivation to get in early with LISK if you find this project interesting. How much ARK will that yield you at the end we cannot be certain since with each contribution to the TEC value of each ARK goes up.
Are you not concerned this will be bad for risk/liquidity for ARK team? It is easy enough to convert BTC to LSK via exchanges or even shapeshift, so many people might do that. Now the ARK team will be left with a bunch of LSK and its price would be more volatile than BTC and have a higher risk. Also liquidity is an issue. This happened with Maidsafecoin when they launched and took donations both in Mastercoin and Bitcoin, which ended up in a disaster.