you're being quite reasonable in warning authors not to obsess. In the bigger picture, though, agents do have different submitting styles. Some love auctions, while others refuse to even consider doing them. Some even prefer exclusive subs. An author has to be comfortable with stuff like that (and needs to know it before signing with an agent).
An agent who refuses to do auctions?
An agent who only sends to editors on an exclusive basis?
Comfortable with that? Are you insane?
Here, have a clue stick, hit yourself with it, cause an agent who categorically refuses to do auctions or multiple submissions is not someone you EVER want to be comfortable with.
It's not quite 10 am so there's hope you won't be nitwit of the day with this comment, but something REALLY amazing is required to over take it. (well, you're safe, the post above takes the cake)