A film investor is firstly someone who is passionate enough about films and film making to risk some of their hard earned cash in a project.
Secondly, if they are savvy, they know that they are making a risky investment.
Thirdly, because they know they are making a risky investment, they expect a decent return on their money.
A producer, if he or she wants to go back to investors a second and third time, cannot take the investor(s) for granted. If you do there are government agencies which which will give you grief.
Investors make your production possible, without them you have nothing, so treat them as “partners” in your project and share a reasonable amount of the profits with them.