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Is there another way to sell written content aside from submitting them to a AC/Triond/Bukisa type site, PLR Articles, or eBooks?

It just seems like these are my only real options when I'm not having content written for my websites, and the income possibilities, without risking a ban, seem fairly limited.

If your articles are of high quality, why not try creating mini sites and earn from adsense? That's what I would do. Although, it's a lot of work, the benefits great.