How much should the proportion of online advertising expenses to revenue be reasonable?

It depends on the overall income, profit and recognition.

For example, some projects have earned 90% of total revenue 10000, advertising fee 1000 and advertising fee 10%.

But it's only 90 thousand

But the other project is100000. Even if the advertisement is 90% 9 million, there is still100000 left, right?

This is a completely different concept.

It does not rely on rigid formulas to judge the law of development.

It is also one of the reasons why countless people died at the starting line.

Many people just know how to work like calculators.