Okay, that's one reason for not indexing the site. However, the poll question implies blocking it for traffic reasons. I'd vote for robots.txt'ing out the /x UR

Okay, that's one reason for not indexing the site. However, the poll question implies blocking it for traffic reasons. I'd vote for robots.txt'ing out the /x URLs, then re-running the vote with the question of "should we deliberately ban search engines so that we get less growth in visitors."