Suspicious Requests

"Hi,

I have a client for whom I'm looking to purchase advertising from quality websites. I've had a look at your site at http://beleagueredsquirrel.blogspot.com/ and think that it would be a good match for our client, whose target demographic is similar to your own.

We would be interested in purchasing advertising in the form of a text-based link on your site. To reduce unnecessary administrative costs we prefer to pay a fixed annual upfront fee for such advertisements. Once the ad has been placed, payment can be made quickly by PayPal or check.

Please let me know if the above is of any interest to you. Thanks in advance."

How odd to send a request like this without even hinting at what the product in question is. Surely nobody would say Yes without knowing what they were going to be advertising? And how likely would it be that, given that I currently have no advertising at all, I would want to have just one advert for this product? It would surely make it look as though my blog was a cover, whose real purpose was to advertise this thing (whatever it is), which would just make people suspicious and unwilling to read on?

People are funny. I won't be taking them up on their offer. Not that I even have a clue what it is.