When you have an enchanter in your party, getting drops in a dungeon can be sort of an autopilot thing: you hit the disenchant button and move on. Reader Akwihahlo actually sort of has a beef we this. As he points out, the Dream Shards you get from disenchanting a blue BoE on most servers only go for around 5-10 gold a piece, assuming you can sell them at all. In the meantime, the blue might go for more on the auction house to a player still looking to gear up for dungeon runs, or it might just plain vendor for more than you could get from the dream shard. With the new functionality that automatically shows sell prices in the tool tips of all items, it's even easier to tell when an item is lucrative as "vendor trash."
For my part, I tend to be the type to greed lucrative-looking BoEs (or even BoPs with very high vendor values), but I don't sweat it if others do. For some people, it's not so much stretching your gold as getting the run over with so you can get to those 2 extra emblems at the end. What's your method? Do you consider the pros and cons before you hit the disenchant button, or do you prefer to just hit it and get on with the run?