EPS10 files with live transparent effects?

Hi.

I need to save my vector files as EPS10 files becasuse I sell my designs on various stock sites and that is the format they require. 

When working in CS6 I could use transparent effects, save as EPS10 and those filters would be live and editable when opened in any version of illustrator.

Now in CC, when I save to EPS10, all of the effects are rasterized and flattened, and the stock sites will reject my files.

I see other contributors uploading work with effects all the time.

any ideas on how this is possible?

I have contacted Adobe support and they have no answers.

Thanks