Wikipedia:Quote your own essay

The popularity of essays and information pages on Wikipedia is growing. During articles for deletion discussions, editors may sometimes quote essays and information pages as supportive material for their arguments. From time to time, other enthusiastic editors may point out that the first editor is simply “referencing their own essay” and imply that it is not a valid argument.

Examples:

How do they know who wrote the essay, you might ask? It is not a difficult task to check the history of a page and learn who the primary contributors are to that page or article. There are very few "secrets" on Wikipedia!

So what are the reasons both for and against quoting your own essay in a discussion?