What is the minimum for participation in the pre-sale?
The minimum is set at 10 Eth! There is a feeling that the creators of the project want to weed out small investors) but this is just the pre-sale.
During a presale it sounds normal to ask for 10 ETH as minimum investment. You don't want to deal with thousands of investors during the presale. Usually you want to pick strong strategical investors to get started.