D&D General DM's Guild publishing: How much do you preview?

[J-H]

My Castle Dracula (Castlevania) campaign module on the DM's Guild currently has the DM advice, introduction, and 1 page of the first stage as a preview. I have (already included) a pretty substantial campaign log. I'm thinking of adding it to my preview, but it also contains plenty of spoilers for any players.

How much do you include in campaign/module previews? Does it actually make a difference?

 

[Burnside]

10 pages or so. Don't worry about spoilers for players - your potential customers are all DMs. A good preview is important.

 

[pogre]

A decent preview that includes an adventure overview is a key factor in whether I make a purchase.