Hi Leumas
After 15 years managing Hotels in London and the Middle East, I have never worked for a hotel company that either refills the small bottles of shampoo, shower gel etc or reuses the soap bars. Probably not too environmentally firendly, but in my opinion it would just be too labour intensive to do as you have described. I have worked in hotels that have used dispensers in their bathrooms and these we did refill.
Max