Around the time I was born, my mom and biological father broke up because of domestic violence. He helped us with money in the first year of my life but then went to work abroad. I didn't seen him for a over a decade (he didn't have any interest in me, nor I him). Fourteen years after he left, my mom, my stepfather (who I consider my real father) and I encountered him on the street with his family, and he talked to me and asked if we could get together and catch up on each other lives. I didn't mind because he is my biological father and I had some questions to ask him. Since then, we've met up 1 to 2 times a year and talk about random stuff (because we don't have that much in common) and he usually gives me money (150€ to 250€).
The only reason I meet with him is because the money, I don't have interest in him beyond that.
Before I meet with him, my mom gives me a speech about what he has done to us and that he didn't support me in the first years of my life. I told her that the only reason I go is to have some money. I don't have financial problems but having more money is better. Is my mom overreacting or I should feel bad about all this stuff?