The costs look unrealistic to me.
With any business you have some overheads and costs, but you also have control over expenses too.
I very much doubt people are spending a big wad of cash on new bodies and lenses every year, you can trim costs with s/h equipment and I would not expect a serious outlay on lenses if you've been around for a while. Other areas such as computers well again you've no need to dump $4k on computer either. And I'm pretty puzzled how you would spend $1500 a year on hard drives.
Some of the cost listed are IMO excessive for a photographer, maybe he's super busy so I can get part of that. But you control costs and there are many ways of doing that. One reason many work from home that kills any cost of a studio (but it also will bring in revenue so that has to be balanced) gear purchases can be curbed significantly too by being a bit more selective. Expenses such as phone, car/maintenance etc have always been deductible business expenses.
The important part here is to make sure you don't exceed your income with expenses ie make a loss. If that means you have to cut down your gear lust buying then that's life.