It is very likely that someone in a Disney office is monitoring and tracking amount of reservations V amount of drinks sold. It is very likely that there is a daily tally, a weekly tally and a monthly tally. It is very likely that someone in a Disney office knows the number of drinks sold and the number of people who had reservations for any given day. This is a data driven world world now, everything is tracked and monitored and analysed. It makes no difference what the CM's at Ogas allow, what matters is the numbers, the figures on someones spreed sheet, the graph and trend created from the numbers on a spreadsheet in a Disney office, probably in Burbank.
They most likely have a cut off point. They most likely know at what stage they will start enforcing a minimum spend just like with Be Our Guest in Florida. These decisions are planned months in advance. Its not an if its a when. For example, if there are 2000 people who have entered Ogas that means there should be in theory 4000 drinks sold. But if they see only 1000 drinks sold, it means that 50% of people who have been in Ogas did not make a purchase. This is where the number crunching starts.
They would then monitor and track for a specific time period, to see if this is an emerging trend, or a once off.
If the pattern is repeated on a regular basis, either every day, or on specific days, that's when they will change the rules regarding minimum spend per reservation.
Its just a matter of time and how many people feel that its ok to make a reservation but not order anything