I make a bit less than you, and have also been approached by investors.
I'm not sure what an investor would bring to the table. I guess they would tell me to hire people, tell me to raise prices, tell me to do more marketing, etc. I doubt they would pay me substantially more than I make now without substantially increasing the amount of work I have to do.
I don't really want to do any of that. I've tried hiring people, and didn't like the responsibility. I realised I prefer working on my own. I make enough money to support my family, and I prefer having the free time to read HN instead of hustling to get more people to buy my app.