How max someone can invest? is there any? interesting
The maximum participation amount is limited to the current number of sold tokens and hard cap.
What wallets do ppl use for their ETH Tokens then?
In order to participate in ICO, you should have an Ethereum wallet (ERC-20 standard). Such as: MyEtherWallet (no download needed), MetaMask (Firefox and Chrome browser addon), Mist (Desktop), Parity (Desktop), Parity + Ledger (Hardware wallet)