This will cause increasing problems in the future, because laws for collecting permits in various countries are becoming stricter and more complex. Institutions will have to stop accepting collections if donors are unable to establish clear title to the specimens. If they were collected after around 1980, they were probably acquired illegally. Collectors who plan to donate their collections in thirty years should establish a relationship with an institution now. The staff there can advise on getting collecting and import permits.
Financial support is appreciated.
This is just the cost of keeping the roof on the building, heating, air conditioning, sweeping the floor, etc. That is why museums think twice about accepting donations, and why they often ask for financial support for curation. Preserving scientifically important collections is our mission, but with limited funds and space, we have to be careful what we preserve. Different institutions have different priorities. Some museums do not have space or funds to add material even if it is of scientific value.