My dad believes that the money that comes in the haram way will go out the haram way. This is what he always told us (kids): If I charge them higher prices based on gas prices or whatever and bring home, lets say, $1000 additional per month, then one of you gets really sick and I end up taking you to the hospital and spend $3,000 on you, did I really make more money?
I believe he is right. I have seen those people who charged others more were never satisfied with their money and were never content. Whereas Alhamdulillah we are very content. We had 3 meals a day and lived a very good life. We may not have had up-to-date video games, or brand new cell phones or expensive cars, but we were all healthy, we did well in schools, we now have great jobs (I am in Capital One’s management and My younger brother is an Engineering consultant - 3rd brother is in college and sister is in high school). Overall, we have peace in our family and we are content. 
to your dad