If everyone took the view 'why should I join the voluntary register, why don't I just wait and save 10', then quite simply there would be no compulsory registration and our profession would remain unregulated.
One of the points that had to be proven was that there was a wish for med techs to register. This was achieved by showing how many had signed up for the voluntary register. If only a small number had signed up then the whole registration process would have died out in the early stages.