Less of a quirk and more of a cheapo strategy. If I've calculated a forcing line/win, I want to see it through then and there (using conditional moves or whatever else) LEST I forget what I was doing 2 days later.
By delaying your move, you stand a chance of your opponent forgetting what was going on, especially if he has a lot of games going on simultaneously.
Despicable ... yes ... but I've seen this happen often enough :)
makes it so that the guy I am beating in online chess sends a move every 2.7 days, while the guy who is a rook up and crushing me in an endgame sends a move every 2.7 minutes? Just wondering.