If that's ok, i would like to give you my opinion on this deal you're running at Appsumo:

App is good. Deal not that much.

I imagine you're trying to create the initial mass customer base and for the product gain reputation on the market, but the truth is that the risk-reward on your deal seems not to be so far that attractive for early investors like regular Appsumo member. If it's something i really need in the future (monitor 100 links), taking your monthly plan price when you're a bit more established, it's not that costly, but at the current time i need to make some math to invest in you and your product.

Can imagine a bump on sales and engagement at the listed price at $99 and like... at least 1000 domains included. That's something AS members will probably be more willing to take a bite IMO.

You're not just giving away "cheap deals". You're growing, collecting amazing feedback, free bug hunt, features request / discussions that will make your app more appealing to future customers, etc etc.

My advice is to check some of the best sellers here at Appsumo in any category. If you feel your offer is not even near on the generous limits that that successful app campaign is offering, you've easily identified the problem already.

Thanks, and congratulations on the product.