eBay limits both the number of listings and the total dollar value of listings you can create per month. If you hit your listing limits using JoeLister, then you will see a notification at the top of your JoeLister dashboard that says, "JoeLister can't increase the quantity on some of your listed items because you've reached your eBay listing limits."
JoeLister can still decrease the quantity on your listings, so this is not a problem as long as you expect that it may cause the eBay listing to have lower "available quantities" than desired.
Raising your "Preferred Listing Quantity" will make you more likely to go over your listing limits as well.
JoeLister has secured a partnership with eBay that allows certain sellers to have their insertion fees waived and their listing limits increased.
If you want to apply, please fill out this new form: