Most sailing ships take what they call trainees, who pay to be part of the crew. The Picton Castle takes people who are absolutely raw recruits. But you can't just ride along. You're learning to steer the ship, navigation; you're pulling lines, keeping a lookout; in the galley you're cooking.
Taxpayers will not stand for - nor should they - the funding of poster sites, leaflets or advertising. What people will support is funding for political education, for training, for party organization.