1- Gas price, to them its not a significant amount, its a business expense, they profit much more, when the token gets listed on popular lists due to this, which brings up new holders , who pump up the mcap by a lot, as the lp pool on these tokens is very small (only a couple of million dollars, compared to mcap which is way higher)

2- pool on tokens like these are usually only made by the owner themselves, so pool fees goes back to them.

3- They do this to invite new people, and then inflate the token price, and rug them by either pulling the entire lp, or just exit it , in a few mins.

Some also do this, to qualify for potential centralised exchange listing, down the line (instead of rugging).

If you own most of the lp, most of the fees go to you.