What are the infuriating/useless/weirdest/best/etc things you've spent money on as a writer/author?

I'll go first:

Most Infuriating. Independent editor who rather than give me pointers went through the whole manuscript and then just said to "nuke" all of it. Cost me $1400 for nothing.

Weirdest. Official song for trilogy. Totally useless but also totally worth it.

Useless. Every writing contest ever. Most are scams and they never have the decency to reply back with a rejection anyway. That, or Facebook ads. My LGBT books just got hate comments. Then again... I shouldn't have expected better from it.

Best. Microsoft Word. Sucky program, but every publisher and editor I worked with used it for editing, so it was an essential tool.