Unfortunately, the subscription model tells us that if these new users were to join Hive without buying a lot of HIVE, then the price of HIVE would not increase. In addition, new users who don't have a lot of HP on their accounts are unlikely to earn a lot of new HIVE, which means that these accounts will not work as a trap for the newly minted HIVE either.
For attention trading, which is the only sustainable model in the long-run, to work the user base MUST grow by many orders of magnitude.
This is why our initial focus is on restaurants. Small number of active diners can generate a lot of dish reviews. This way we don't need mass adoption to build a solid business.