I woud however not charge ‘additional’, as obsidian sync alone is already several times more expensive than what you pay for other products for sync and all their other online services. Price wise i don’t think the value to be over 4€/month for syncing, and that would already be considered expensive. So for 10€/month it should already by the higher tier, with more vaults but especially much much more space ! can get hundreds of GB of storage online for just a few bucks a month, i don’t see why it is so limited.