It is already nine years since we applied for this and being a Claris Partner helps:
The listing on the website as well as recommendations to prospects by Claris employers helps to bring business to your company. You get a discount for license purchase so you can make some money selling your solution bundled with the FileMaker licenses and offer one stop shopping to your clients. You can list your products on the marketplace and use Solution Bundle Agreement if you like to sell a lot of bundles. Access to beta versions, extra training sessions, exclusive partner meetings and a few test licenses are included. And you can bundle tools like the data migration utility with your solutions.
If you like to become Claris Partner, you can read more on the Claris website.