Why token pay for listing of exchangers

[fudster]

Because if tokens are not listed, it be considered dead shitcoin. If you are a developer and investors are exclaiming right on your face about the token be listed on the exchange, you might see the price of the token dip to its lowest when all of them sell at the dex. If will affect your reputation as a develop.
There are many tokens are not yet listed on exchanges though, the team prefer to just develop their project than paying.

[Accts4u2]

Is it necessary for token or coin to pay huge amount of bitcoin or ethuruem  for it to be listed on Exchange...
Why exchangers charge millions of dollars to get a token listed on their exchange?

It depends on the exchange, the reputation of the exchange that a coin is listed on can do a lot to the price and value of a coin. Only the biggest and best exchanges charge a lot of money but when you are saying millions of dollars then you are just exaggerating. These exchanges are projects on their own and projects need money to run, they cannot make their services free