Money should go to the developer not retailers. Gamestop makes $1.4B in profits just from used games. They made $2.2B in profits 2012.
Sony hasnt't made a penny. If you add the profits of MS, Unbisoft, EA, Square, Capcom it is not the same as what gamestop makes every year.
Folks like Collin, Greg from IGN has spoken about this for years. Even in GT weekly podcast they spoke about it. Every one keeps saying that money should go the developer.
Right now, if they say any thing explicit people will get all rallied up that they are being paid by MS to act as their PR. So any one who doesnt support used games are simply not being very vocal.