Unless you are that customer. Imagine going to a carpenter and then receiving an invoice for him renting a hammer. Wouldn't that look a bit odd?
In other words it is commonly expected that professionals come equipped with the tools of trade. Not that this is set in stone, but that's the state of affairs and trying to do it differently is an uphill battle.
>In other words it is commonly expected that professionals come equipped with the tools of trade
Not always. Construction firms hire a lot of what they need for each job, because it is not economical for them to store and maintain the enormous variety of tools/machines that they need over the course of a year. They'd need a huge warehouse and a whole team of people to manage and maintain all the equipment, and at that point you may as well start running a hire company.
They don't invoice you for each rental fee in an itemised fashion, for the same reason they dont invoice you for each screw, each nail, the fuel for their vehicles etc: you don't give a shit.
The same model applies in film production, where (literally) tons of very expensive equipment get used for brief amounts of time by people who are hired based on long-standing personal relationships, then equipped by rental shops that can afford to maintain the massive inventories of often peculiar parts that are needed on any given show.
Actually, it's not the parts that are peculiar, it's the amounts and configurations that tend to vary. In any case, it makes good economic sense for everyone involved to handle labor and kit separately.
I worked for a big general contractor (top 100 in the US) for a number of years and they regularly had tools and equipment factored into their bids because about half of them walk of each job (not that you can fire union labor for that).
Sometimes heavy equipment is added on by contractors. For instance, I can dig this ditch with a shovel, or we can rent a backhoe, and have it done in a few hours.
In other words it is commonly expected that professionals come equipped with the tools of trade. Not that this is set in stone, but that's the state of affairs and trying to do it differently is an uphill battle.