There are lots of people who do not have bitcointalk accounts. If you go advertising to popular conspiracy forums as I have it stands that you are going to get new registrations from these people looking to get a stake. Limiting stakes to existing older accounts means you're only attracting people who already know about crypto currencies, and not potentially new people.

I understand the concern of sock puppet accounts, but this is really something the forum management could manage if they wanted... or if there's that much concern make people register to a different forum that is controlled by the coin's management and require that people have one IP address per registration, and if it's found their IP address is constantly changing all the time within the same account, they lose their stake. Likewise if they register multiple accounts with one IP address, they lose their stake.  That would be fair.  Most people's IP addresses don't change frequently.. mine will only change if I clone my MAC address on my router to something else.