What do you think about the possibility to buy tokens directly via one marketplace ?
How is that different from bittrex or polo? You can buy almost all tokens in these places.
But you cannot buy tokens from these sites using fiat. These are exchange platforms. You will have some token to start with before having the ability to have some other coins. Most of the time, it's either you already have some Bitcoin or Ethereum. And then you can convert them to another coin from there.