As one who no longer has the 'luxury' of bringing the unused or partially used hotel amnenities home with me, I applaude your (hopefully successful) actions.
For sure, the cost of these items are built into the price of the room (the negative post by IFFF has been removed, but can somewhat ascertain its drift) by each and every hotel. Just a note though -for those who may be overzealous -towels, bathrobes, sheets, televisions and lamps are most likely not 'included' in the price.
Way to go M! Seriously. Thanks from my heart - hope it works.