Are arXiv papers more read than the journal versions?
Well, statistically speaking, ArXiv requires no reader subscription, so more people have access to it (regardless of what publications they or their institute pays for). Ergo publications on ArXiv have the potential receive views from a wider audience. Whether this translates to citations or not is another argument.

It’s relatively common in my field to see an author "park" some research on ArXiv before submitting it to official publications or conferences. The publication process can take a while (and conferences have fixed dates), but the paper might as well gather interest and citations during that time.

I’ve never heard of anyone publishing on ArXiv after publishing in a journal, but I have seen post-conference extended papers (which go into more detail without the page limit). I don’t know what copyright you signed over (or what access level your publications have) when you published but I’d be wary about infringing the official publisher's copyright by posting on ArXiv. 

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Well, according to comments, some journals explicitly allow publishing to ArXiv (or related sites) after publication. That might depend on gold access level, but it makes sense for journals to make ArXiv an ally rather than an enemy. Relevant xkcd.