Or they aren't as well known as older charities. Groups that do controversial work may find it harder to raise money because many people prefer to give to organizations doing the type of charitable work that seldom generates controversy, such as feeding hungry children. Groups that rely completely or mostly on volunteers obviously will have very low costs. Gifts to them can go a long way. But relying on volunteers can lead to problems such as high turnover.
Many people prefer to support charities that are working in their own communities.
The work of such charities often seems more concrete. You can see it. Your neighbors or your community as a whole may be directly benefiting from their work. It may be easier to learn about the work of local charities because it is highlighted in a local newspaper, or someone you know may work with the group. You can work with the group and develop the kind of insight that only comes with close involvement.