But a whale can made 100 accounts and invest 100 btc, there is no effective way to limit the amount of investment allowed. For this a lot of users ask us to remove the 500 btc limit. We are still thinking about it and give our final decision during the weekend.
Lol man, you can limit the access per IP, when any user open an account on ico page you record the ip.
If a whale made 100 accounts with different IP, he deserve to have that accounts, but at least more people have the opportunity to invest in first hours.