Its supposed to change you displayed quantity but it has a timing issue that can result with your entire inventory being shown to eBay when then ENDS IMMEDIATELY all your listings if the quantity is over your limit.
Their awlful customer service denies they ever have a problem even when it documented
Its got to be some teenager in mom and dads basement to be this bad.
Their maint times are during peak US periods and it doesnt run in the back ground while they do maint so you are screwed when you inventory runs out.
Pay for a real service as this one cost me $1000s and a compromised account snafu that they started by being off line.
Scarcity Manager is more expensive but as I found out the hard way you get what you pay for.