Giving the earlier investors discount is a must for ICO's project. Without it, such ICO will be hard to get supporters. I hope repu will offer it too!
Well a small discount is ok, but recently you can see so high discounts, which brings in a lot of dumping in the beginning. I would prefere a small discount or rather none, because if someone is interested in a project, he will probably also get in with none discount.
Considering their max. bonus in the presale of 15% for contributions from 5 ETH upwards I think there won't be a huge bonus, if any.
There really could be a considerable dump after the rewards, but with Repu's potential and all the admirers he got, he would certainly make it easy for himself in this eventuality, I would be particularly attentive to this event to make new purchases and wait for a new explosion, which would certainly happen