Thank you for all your answers.
We will to 90% use a coin as it's simply easier to handle.
We continued discussing pros and cons and also respected your answers but it's on the hand that we have to use a coin.
Our platform will always work with the currency we use and in Ethereum/Solidity every transaction/work with the coin needs a third party coin, Ether/Gas.
So when - just for example - you buy product X, it costs the token + Gas/Ether.
But when you use the coin, you just need to have the coin, nothing more.
Also we discussed, that we will create a webwallet, so there will be no need to download any tool/program but easily handle all your coins like MyEtherWallet.
Thank you everyone for your answer and also thank you for future answers! We're still open for your suggestions
