I bought a WSO pack that came with 10, 500 word articles. So far? 171 views, 2 clicks.
I opened a separate EZA account just for these articles. On my personal account, I have thousands of views and hundreds of clicks, not a single 500 word article either. I think people's attention spans are terrible these days and this is a huge reason why 500 words just don't work that well for funneling traffic. They're great for site content or getting organic traffic, but not for getting indirect traffic. Additionally, these 500 word articles are in a hot niche, where people SHOULD be clicking more than this.
This is just a warning! Go with 300 words if you are trying to get traffic through EZA.