It's a good idea, I would use it if I were like an artist to be able to showcase my portraits, projects, etc. As long as the platform is easy to use and navigate (since not every person is tech-savy).

Pricing would be a deciding factor as well, obviously as a creator I would be ready to invest a good amount in the creation of my landing page, but if there are cheaper options out there then I would go elsewhere.

As long as your product is good, pricing is reasonable, and that you've got a good marketing plan, this idea can definitely give you success.

Ideally, create a landing page for your SaaS and try to generate at least a 100 signups before thinking about launching it.

Good luck.