If a single darkcoin has a value of over 10$ now, think of where it would hav been if it wasn't instamined.
Lower - as with all coins killed by daily inflation.
The instamine worked great to provide sufficient market liquidity upfront, first miners were selling DRKs left and right for batches of 10.000 DRKs / 0.25 BTCs and thus the issuing rate / debasement rate of the next coins was better. Epic win.
Fast mining at the start => quick distribution at dirt cheap prices (nobody valued their instamined coins) => slow inflation next => good for price stability / increase.
DRK is issuing 2880 coins, BTC 3600 and LTC 28.800 coins per day.