A thousand times amen to this. At home I share a tube of toothpaste with my wife: if we go on holiday together, we bring the tube with us. If I'm travelling solo, for business or whatever, then the home toothpaste stays at home, so I need to remember to buy a new tube to take with me. It's the only thing I need to expressly purchase other than the hotel room booking. This can't be that unusual a scenario... can it?
I made up a theory that it has to be sourcing problem. Toothpaste is one thing that you don’t hear small supplier making on their own - I get to hear all the time about handcrafted artisan soaps, conditioner, shampoos etc. but not toothpaste. So for hotel industry it is very easy to source small supplies of toiletries other than toothpaste.
And on the other hand name brand toothpaste manufacturer would not be interested in setting up manufacturing lines for small toothpaste tubes (the fact it is a tube, which essentially needs a pumping machine to fill it up supports this line of thinking) for a niche segment where volumes would be minuscule as compared to their traditional channels.