Many of the kinds of clients we have - charities, tech for good companies, third-sector organisations, unions, local government, lobbying groups etc - are pleased to work with someone whose profits are used to further aims proximate to their own organisations. But in pitches to clients I don't think we make it the main selling point, but part of the overall package.
In my experience engaging consultants, I've never asked how they spend their profits. It surprises me that would be your major selling point, but maybe your clients are spending other people's money.