In my experience, using random phrases gets your ads flagged very quickly. Most saavy CL users recognize the open white space for what it is, and they only need to highlight the area to see the text. When they see the random text, they instantly flag it as spam.

Unfortunately, it seems that no matter what you do, the CL police will come running to flag your ad. All you can do is make your ad seem LESS like spam, so I would use the tokens.

You'll still have to deal with the flaggers who think your service shouldn't be advertised.