Why convert to short bed?

[cletusboy]

Doing a lot of researching and reading lately. Wanting to know everyone's opinion on why converting to a short bed is so popular, I've even seen that it increases value. In my opinion that would start making long beds more of a rarity and increase the long bed value right? I have a long bed and plan on keeping it that way. Do short beds drive better? Just needing some insight.