Hmmm, let's see. Although that might be good for your bottom line today, it could have an effect on it tomorrow. Sometimes corporate contracts include a volume guarantee and if the company does not fill enough rooms during the term of the contract, there may be a penalty payment due or a higher rate during the next contract term. And on the flip side, some contracts may limit the number of rooms at the low rate, so by using company Y's rate, you may be denying one of their employees being able to get that rate. YMMV

It's things like this that cause properties to be sticklers on IDs and the such and as more people abuse the program, we will see more properties invoke insane rules like seeing company names on company IDs (not unreasonable, but not always possible). I have heard some claim just because they show rates online without verification, that they can be considered publicly available rates (i.e. Government rates).