I'm not sure what sites you're talking about, but all the major exchanges use normal prices.
I'm fairly new to bitcoin, so perhaps I'm just unaware of what is "normal" prices.
For instance, If I go to blockchain.info and try to sell or buy bitcoin on my account, I can see the following:
current rate:
$4,169.09buy 1 bitcoin for:
$4,236,19sell 1 bitcoin for:
$4,031,99I think that's pretty big gap with the current rate and I don't understand that difference in price.
we have low liquidity comparing with traditional markets.
Bullshit. The liquidity is about 3 billion dollars in a 24 hour timeframe right now.
For instance, If I go to blockchain.info and try to sell or buy bitcoin on my account
There's your problem. Blockchain.info is not an exchange.
Did you see the link I posted? It shows all of the major trading pairs with Bitcoin. If you scroll down, you will see that the fiat trading pairs have pretty much the same price as the market price. Blockchain.info is not an exchange, they just partner with the service Coinify. Coinify is also not an exchange in the conventional sense, they just allow spending with credit cards and have crazy fees (and incorrect exchange rates) in order to protect against the huge risk of chargeback fraud and to earn significant profits.
Now I am oversimplifying this a tad because there
is a slight gap between buy and sell prices on the conventional exchanges, called a "spread". However, it's not that significant and it happens naturally because of market forces and any other market (like gold for example) would be the same.