No, it doesn't mean you're not checking in often enough. It would actually encourage you to check in more often. See, if I don't check in often, and I keep geting these e-mails, then I know that I should check in more often... each e-mail is like an invitation to check the site.

update: Er... YES, it does mean you're not checking in often enough... there is that proof reading again. sigh.

Each e-mail would inevitably have to end with something like:
Check this link in the next 24 hours or else.
Signed,

TM

vroom | Tim Vroom | vroom@cs.hope.edu

24 hours is kind of short vroom. Maybe 168 hours... or else. (uh... or else what?) >8-)

update:
OH!!!!! shudder