This is strange.
If they are already founders, i.e., they have already sent in money, then you have no incentive to reward them additionally. This appears to be an attempt to appeal to potential founders. Why would you do this? You could get all the funding you need - just look at all the posts from people who would love to be a part of this, including me - if you just front up with some code or a whitepaper or proof of your identity.
We want higher rewards in comparison to the people that get in via Kickstarter or any other form of additional distribution. Next did the same thing, first phase participants received 3x NXT. Ethereum is also doing the same thing, investers within the first week will get 2x ether. XCP did almost the same thing, where people that burned early received 1500 XCP, if you try to burn now you get less than 1100 XPC. It's not uncommon, higher risk = higher reward. Level coin obviously didn't want to give founders double or triple so he opted to give us 50% more. There are still 2 days left to get in at 1.5x which is a reasonable advantage.