I’d consider energy use. I use a projector for home cinema and it draws more power (over 200W) than I would want to pay for to run for a whole working day.
It's less than you'd think.
So she’s paying $350 more up front just for set up, and then $50 more per year just to use it. How is that “not that bad”? Seems wasteful, especially if the person in the blog claimed that $1k was “crazy expensive” for them.
$1k is pocket change for a lot of people on this forum, including myself, but if $1k is a lot to you then this seems like a strange purchase.
criticism aside, this is a cool project and i enjoyed the blog post.