Today there are 573 groups (bands and tribes) recognized as Native American by the government. Those tribes which have already achieved federal recognition do not want the process made easier. Some spokesmen discuss what other kinds of groups might be encouraged, without encroaching on the recognized tribes. Cherokee Nation spokesman Mike Miller suggests that people with an interest in Indian culture can form heritage groups. Federally recognized tribes are suspicious of non-recognized tribes' efforts to gain acknowledgment, concerned that they may dilute already limited federal benefits. As casino gambling has raised tribal revenues dramatically, there is more competition by tribal groups to gain federal recognition and the right to operate gaming on reservations. Gaining recognition also is a way for Native American groups to assert their identity, their Indianness.