Sooner or later you'll need more money. If you haven't done any fundraising in the meantime, you'll forget how. You'll have to start all over again to find friends, volunteers, donors. That will be hard. It's like watching a junkie try to quit.
Fund raising keeps an library involved and accountable.
The outreach, the contact with the community, the debates, the demand for accountability, the activities are life's blood to a real community-based group. Better to give the money away then die rich. This is not only good organizational sense, it is one of Carnegie's principles of philanthropy. Too many groups are scrambling for cash and offend donors because they don't take time to say thank you and build strong relationships. Money attracts money.