My concern is: if my ico reached its soft or hard cap and I’m ready to pay an exchange to list my token, why people would trust me while I’m holding most of the tokens? For example, i list 10% of the tokens in Poloniex, and i own 20% of this project, as per my whitepaper,, where is the 70% of the tokens staying at??
You (as a person) do not list anything at all.
If you pay an exchange to list your token, you are paying them to enable the possibility to buy/sell tokens on that exchange.
You can not list an X amount of tokens. You are just paying for the exchange to offer the service of trading your tokens.
The amount of tokens available to buy/sell on the exchange is determined by the amount of tokens which get deposited to the exchange (e.g. by 'investors').