Tipping the maid is obviously not required. This has been on that particular website for quite some time and I have no problem with the management providing a little encouragement on behalf of these employees. You might want to reconsider your practice of never tipping the maid. It is a nice gesture that is very much appreciated. Speaking generally, these are people who work very hard for relatively meager wages. Frequently, they are not folks with a lot of great career options.