Success is not easy for anyone because it doesn't come by itself except with more consistent effort and planning before getting it. And when it comes to telling friends about the level of success and amount of income, I don't think there's any need to make it public because you remember the other risks that can also arise through a friend. Because you also don't know what intentions are in your friend's heart after he finds out about your income and your way to become successful.
So it's better not to share this with many people, even if they are your close friends, because other things that you don't want can also happen to your own business. And you can also provide other options such as the best suggestions that your friends can try instead of telling them about the income you have earned. So it's better for you to just run your business diligently and if someone asks you about how to be successful, just give them advice or a little knowledge that they can develop themselves.
I know you are trying to be more private and discreet about your dealings, in there toughness there should be some joy when your friends win too, I know it good to remain discreet about your business to people but that doesn’t mean your should shut out family , they are friends that can be called family too as long as thier loyalty still remain unquestionable. Well not everyone likes to see other win, I don’t mind showing a friend how to fish. Who knows he might be the lucky charm that fish out the shark, that is something worth being proud of seeing that a friend is doing well in something you taught them. And if he’s truly loyal he will remember you and give you your credit and if he doesn’t, fine ! It life, the earlier you realize that having high expectations from a person will kill you the better you don’t expect much. So I don’t see any wrong on what the OP did showing is friend is ways of earnings.
Unless you’re not proud of where you are earning from, or you gat yourself mixed up in some illegal activity and your proud about. We rise by lifting others, I guess this is not a new phrase. The help you show today might save you tomorrow and if not you, your children can benefit from them. Pitch them, if they show no interest in doing what you’re doing then fine, you can’t force a man to bake his own bread. But if they show interest, gladly show. And don’t get me wrong, I don’t mean you just accept strangers to your circle. It advisable you keep your circle small but sophisticated, you even make better when you work with your circle especially if y’all in the same line of business. It very nice when I see childhood friends become successful together.