Agree with all the above, but let me put this in computer science context:
- bathrooms are a scarce resource
- usage is not evenly distributed, greatest usage is 1. in the morning and 2. when you are running late :-)
- queues form at critical moments and hold up the entire pipeline (e.g., getting ready for work, school, etc.)
The best way for you, or your potential buyer to resolve this bottleneck is to have more of the bottle-necked resource.