All prices are publicly available, I do not see a reason to artificially increase price for storage if it depends on the customer’s usage pattern. Take 2 minutes to configure a bigger chunk size and pay (much) less.
For customers who stores small files we have a pack feature in our roadmap:
The fact that Storj network prefers big files is mentioned multiple times across the site, and you may see that we have many sections related to video streaming and distribution use cases, also backups and other use cases where data volume is bigger than a single photo.
Please note - our target is not consumers, but Developers, DevOps and Enterprises. Consumers may use Storj too, but they will miss a lot of consumer features (which should be implemented in consumer applications by third party Developers), include efficient storage usage for tiny objects (the usual consumer’s use case).
Right now you may use restic or duplicacy to store tiny objects more effectively.