It seems like the coin was ninja launched / premined. How much is premined?

There is no premine no ICO no scam

, We will launch the store when the total Coins Created reaches a certain number
You say there's no premine, but that's strange because your genesis block was mined 27 hours ago.
And the subsequent blocks were mined before the ANN was posted, up until about block 500.

The launch of the currency was yesterday, and has been announced in various forums
Which forums? I dont see it on BitCoinGarden.
You can't just announce it to your living room and call that a public launch. If you're actively trying to prevent people from picking up on it (like this, the largest forum) then you're pre-mining.
there is an announcement in cryptocointalk forum , total blocks mined is 746 that mean 7460 madcoin created for now , that balance not available in one wallet , where is the premine sir ? madcoin avalaible now at 3 mining pool and there is more people come to mining , you can check more information when we finish the explorer , have a nice day
But you mined 270 blocks before you announced it on cryptocointalk

I haven't seen the code and I don't know if the rewards for the early blocks are also 10 MDC, but it's at the very least a ninja launch, which is unfortunate for a scrypt coin.

Like I say the explorer will help you to get to know if we change the reward or not , before the announcement in cryptocointalk , we compile the madcoin in the official dnsseed server and start mining server on it , total reward until now is 2700 MDC

(LOW CPU ),and we just start a giveaway 10 MDC by Twitter follow , We will pay it from this balance
Madcoin will have a long and Interesting roadmap , so we Can not start the project with phishing