Hello @Georgette53 ,
Dealing with gas tanks can be a headache. You'll need to ensure that every guest has enough gas, and if they run out, they'll likely ask you to replace it at awkward hours. Unless you provide them with a spare tank, which introduces a new hazard of misuse and improper installation (you'd be surprised how many people don't know how to operate them). Now, you'll have yet another thing to prepare for each guest, and providing a new tank for each guest doesn't make sense to me.
Not to mention, you'll have to carry it around, arrange for supply, and schedule time for the delivery of new tanks.
For me, the benefit of having this amenity doesn't justify the time, money, and energy spent on it.