Yeah, makes sense. It is a bit of a chicken-egg problem. But the naked ask for signing up without some kind of idea what kind of party wants to be formed seems poorly thought out and might affect conversion. As a complete outsider to the UK, my opinion doesn't really count, however if there are equally uninformed UK voters I am not sure they are going to be convinced to sign up. This is where a leader statement sharing a vision of the party would help. Transparency of who is doing the organizing and statements from them on why they are doing it would also help. Putting a human face on the proto-party with emotional CTAs can only help people on the fence decide to join. The weak, generic narrative of "for the people!" just doesn't cut it.