Honestly, unless you think somebody is stalking you or something, I would be against this. If you want to check out other team's pages, go ahead. I do a who lot of that when I'm preparing for a match. I also like to see how other managers deal with their teams. (I also follow hunches on who may or may not be following the rules by checking out teams. Beware!) In short, I do a good deal of research and would be ringing a lot of bells if you all saw if I was visiting your page.
Would it be so bad? Well, I wouldn't want to give myself away if I was researching a team. And if another team asked me if they could join a PL I was advertising and my research told me that they wouldn't be a good fit, I'd rather not make them feel bad and tell them that they're team isn't a good fit if I can give another not-untruthful reason, but if they saw I visited their page it could make another kinder excuse harder to give. And I don't really want my rivals to know just how much I scout them out before a game, or even that I actually do scout them out, and sometimes when I don't have a game against them any time soon. I can come up with a number of other examples of things I don't like about having my visits entered in a team's guest book, too (but don't worry, it's not about hiding my stalking patterns, of which I have none).
I think there are only two reasons why anybody would really want to know who checked out their team page (not including any stalker issues, which I hope doesn't happen here). Reason #1, to see if their opponents are scouting them. Well, I think that we all know what information that everyone else can see on our team pages, and we could/should assume that our team pages get checked out by other managers. The information they're seeing is no different than, say, reading a newspaper, it's universally accessible information. Reason #2, to see just how popular you are and how great your team that you admire so much is admired by others. My suggestion as an alternative to this is to go to the nearest Walmart, Target, or other store selling items for the home, and purchase a mirror. Then, just spend hours gazing into the mirror and tell yourself how great you are.
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!