It's common in the social sciences, economics, and law to use ssrn.com as the main pre-print server. Lack of LaTeX knowledge doesn't seem to be an issue: people

It's common in the social sciences, economics, and law to use ssrn.com as the main pre-print server. Lack of LaTeX knowledge doesn't seem to be an issue: people just post manuscript-version PDFs exported from Word. I don't think it's as good an arrangement as arxiv.org, because it's a for-profit company, so I'm more skeptical of its long-term aims. But it's widely used.