It's incredibly silly to add the costs of things like your computer upgrades and internet access, and all of the other side-things you mentioned. Those things are expected when you start talking about self-publishing. That's like answering a "How much is a microwave?" question with "well first you have to buy a house with a kitchen, so very expensive."
Your experience is a fairly unique one, so it isn't fair either to include the costs of writing your book. They aren't related to the self-publishing part, which would be formatting/editing/cover.
As a professional the IRS would argue otherwise! They are depreciable deductions. This is the single biggest mistake artists and writers make they don't depreciate the cost of their equipment and tools that are necessary to execute their craft.
As for those expenses being expected you'd be amazed at the number of people who will tell you that no those are not reasonable expenses, you know after all everyone has a computer these days. I've encountered folks who where shocked to find out that I acutally had to purchase a paintbrush, THE paintbrush I used to paint a painting... why they thought it just magically appeared out of thin air, ditto on the paint and the canvas. And because their grandmother has a very old singer sewing machine in the attic my need to deduct that new Janome, actually it was depreciated, for those art quilts I made for samples was just unreasonable.
Moral most people who start out writing or creating artwork tend to forget all of those little expenses and it isn't until the computer dies that they realize just how much they have wrapped up in their self publishing/artistic/creative endeavors.
Annnnnnnnnnnnnnnnd I've self published my four eBooks so it does count!
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