Illustrator :: Every Time Flatten Transparency It Rasterizes?

I need to have my file in EPS, so I need to avoid transparency or avoid vector illustration because some part of the image rasterize. I still didn't find a way, how to make it, but I can see illustrations, which are vectors and saved in EPS and the effect drawned there MUST be done with transparency.
 
I created a simple file, where there is a gradient on the background in layer Bg nad another layer Glow with circles. The circles are made by gradient which goes from solid colour to a fully transparent one, so it can join the Bg nicely.

This is how the circles' gradient looks like.

This is the scene.
 
When I want to save it I select all the transparent objects and all the objects which touch the transparent one. In this case, it is everything in the scene. Then I press Flatten transparency and apply it with following setting. Anyway, every setting (higher ppi) I tried failed.
 
The result: Illustration full of images -> rasterized -> failed.
 
Just for example take this illustration - it had to been done with transparency, but it is still a vector graphics! [URL]