* You can have bitcoin but if it is not being tradable to fiat currency then your bitcoin has no value at all.
It's the same thing with fiat currency too. If the global economy didn't give it it's value then it's just a piece of paper.
Bitcoin doesn't come under any centralized authority and that's why it is paired often with fiat to determine it's worth in fiat currency.
* You need to buy bitcoin with fiat currency without fiat currency you can't have bitcoin
That's not true. You can sell your services and get bitcoin without actually buying it.
Again it's the same with fiat. You sell your services or do a job to earn fiat. Many people in the forum are doing the same thing and earning bitcoin without actually buying it.
* when you buy bitcoin you have to pay services like in those banks and when you like to convert bitcoin to fiat and withdraw it to a banks then you will then again to pay the service of the bank. You need also to pay the bitcoin transaction fee. So fees are everywhere from those banks to bitcoin network deducted by the miners.
You just have to a pay a transaction fees if you are sending bitcoin to anybody.
When you buy some product with fiat you still have to pay the tax for the product.
When you do an exchange of currency (Eg: USD to EUR) you still have to pay the exchange fees.
When you buy gold you still have to pay the maker fees.
Yes fees are everywhere and there's no debate on that.
* bitcoin could stand alone without being paired by fiat currency but we should make it paired with fiat to get the bitcoin with value depending on the demand of the community.
* You can earn bitcoin investing in it but can take losses too depending on you. And this is why i think that many had said that they like bitcoin because they are earning but some that aren't. I feel sometimes bad about it you had your earnings coming from other people knowing that you had bought bitcoin cheaper price compared to the new comers with higher price of bitcoin
Any investment that you make has a probability of winning and losing. Why do you think only bitcoin has a chance of dropping in price ?
There are millions of people who invest in many things and be happy/sad on baring profits/losses out of it.