Most of the impacts of the gay and lesbian “problem” are non-monetary. The “problem” is very divisive in our society. It helps to ensure that conservatives and liberals dislike one another. It helps to divide families. These are not really monetary issues. However, there are some ways in which the gay and lesbian “problem” has monetary impacts on people and society.
The greatest impacts of this “problem” are on individuals. Some individuals may seek counseling if they are gay. They may feel that they can be “cured” of their sexual orientation. Others may need counseling to help them deal with the fact that many people in society do not approve of them. This can be a very difficult thing to cope with. These kinds of therapy cost money and therefore have a monetary impact on those who feel the need to have them. Other individuals can be deprived of their jobs because of their sexual orientation. This is not common, but it is legal in many states.
For society as a whole, the monetary impact is a little harder to discern. The biggest impact would be a loss of productivity from gay people. People work best when they are not stressed. Gay people in the US might often be stressed because they are not accepted by, for example, family members. This can cause them to do their work less well than they otherwise would. If it is true that gays and lesbians comprise up to 10% of our society, there may well be a significant loss of potential productivity because of this factor.