Tourism is not profitable (Cities: Skylines)

They have built a lot of things that tourists have things to do, but have not seen a real increase in the flow of these tourists, and , especially, income with them.
That just cosmolitan that he and all the infrastructure, shows that I have an income of 2500 with Commerce and 4000 with transport and all. Manipulation of the budget on the monuments also did not bring any significant difference in these indicators.
Spent a lot of money on the monuments, a lot of money for the monument, and the exhaust on 6-7 thousand. That's just wrong.