I agree that 1k might be too expensive, that's debatable. @SpaceHelm
@boembchen to answer your question, consumable GFWs will give you the option not to boost people for one straight hour and not waste rental period if they'll hit your target level in 15 mins. Also gives you the flexibility to stop in the middle if something in real life comes up - and that happens.
The suggestion is not to replace the current setup - it's an additional option for people to choose from.