Hi Airfox,
Normally, I don't get into the forums only to state issues that I'm facing, but looking at what you have, if you are satisfied with the SuperSuite. Then awesome, I'll run with it... I ran into the same issues as you did, questioning the reason to buy. Then I started looking at the prices for the things I didn't have. So I bought it... Now I'm not sure how SuperSuite is designed, but with the Designer Extender. Everything is neatly integrated. For instance, I created a custom template, imported it into site sculptor, ran site sculptor to design all the pages within the template, and then ran the CMS Builder that automatically detects every page and places them in the admin cpanel (CMS Builder backend). I didn't have to do anything except build the template. That's crazy for me! I'm digging in to it.
On normal bases, I’d everything from the ground up, and it takes me about a week to get everything full functioning for client’s approval. If I had to buy the components separately, I'd have to pay close to $300. I had everything except Site Sculptor, yet everything that I did have were at least a year or two behind the latest development. So for $40 I'm golden.
In conclusion, work with what's best for you, if there is no reason to buy, then don't but for people like me who are counting my pennies, this was my light and the end of the tunnel.