There is no functional difference in the levels of membership. We simply ask every person who values PMN to support us financially as much as you can. You choose the membership level that matches your situation.
Policy Update 6/9/2020: Since the pandemic set in, many PMN events now require membership. PMN offers a $25 "Low-income" annual dues option on our sliding scale. To maintain consistency with PMN's long-standing policy of not turning anyone away due to lack of funds, if this amount exceeds your ability to pay, you may request a cost reduction for your membership dues by sending a request to <firstname.lastname@example.org>. Please include an amount you are able to pay. We don't offer zero cost memberships, but you can request the cost reduction that you need.