Somehow it seems to me that working with only one main node wont be effective. If youre planning to attract a large number of users, one main node can just fail to deal with such a load and the service will lag, throw error message and etc. Why couldnt you work thus issue out better?
Why do you think that there will be only one of them? It is written in the description of the project in black and white that there will three of them: main, trust and regular.