No matter how much RAM you have you will always have a minimal amount of page outs.
When you completely close an app, it doesn't instantly get purged from RAM.
Inactive memory is still allocated but has been deemed inactive via reference counting. Before inactive memory gets reallocated, it is checked to see if it actually inactive.
If it is truly inactive, it is freed. If it is inactive but is still needed, then that inactive memory is prioritized to be written to the swap file before the other types of memory and is more likely to be associated with paging, including page outs.
The benefit of this is faster performance of apps that are commonly used but the negative side effect is a small amount of baseline paging regardless of the amount of RAM.
This makes sure that you are getting the most performance out of your RAM regardless of the number of apps that are in use. Unless very few apps are open, you will have roughly 2/3 active vs 1/3 inactive memory.
Issues can occur when an app in use has a memory leak. In these instances, leaked memory will be listed as inactive but won't be freed when checked to see if it is still needed. Once the leakage has produced a significant amount of inactive memory with very little of it being able to be freed, paging will increase.
But, this would cause more paging than what you are experiencing.