Nearly all the major photographic collections in the world are paid for out of company money or taxpayers money. It near the top of any senior curator's job description to preserve and enhance the collection they are responsible for. This is achieved by spending other people's money (external funding) not funding from the curator's own pocket. External funding, in the main, comes from government (taxpayer) sources, company discretional investment, philanthropists, and bequests. Very little of the collecting business is done by people spending their hard earned.