Hi there,
My view is that perhaps, some owners are not charging enough for hangarage. I think it's specific to each operator/hangar keeper.
However, I would say that £725.00 per month is a perfectly reasonable price to pay if the Hangar is smart & tidy and doesn't have holes in the roof.
If the handlers do a good job and the aircraft is presented to you on time, clean and with the correct amount of fuel that you have asked for, I would suggest that you're not paying over the odds.
It's only £24.00 per day, averaged over 365 days
Xavier