Some things are best left unsaid. Take that any way you see fit. 
I didn’t tell mine about my Yarbo purchase until a few days before it showed up. She wouldn’t talk about it for 6 months. Didn’t want anything to do with it. I don’t know what she thought I spent on it, but she finally got over it one day and went to the website to get me a present for some holiday or something and then she goes… I’m sorry. I thought you paid a lot more than that for it. Then she was like, I just saw the mower cost and that’s as far as I’m looking! She’s like, I know you and I’m sure you went all out! LOL, she’s right…
She’s a keeper!
She is indeed. I don’t deserve her and she deserves a medal for putting up with me for almost 26 years. 
My wife didn’t know about my Yarbo purchase until I showed her all the boxes stacked up in the garage. Her response…. “Oh great, another robot!” 
She knows me very well!
That’s what she said when I got my second and third one. “why do you need another?” Because… Just because…
Accessible spare parts
Yarbo was an unexpected bonus from work, I didn’t tell my wife until it showed up. She likes trying different budgeting apps/methods so depending if she’s trying to figure something out or not she’ll notice purchases when she goes to categorize everything 
. I’m sick of all the stupid apps that require you to actually do work, I miss Mint. If mint would have stayed around and not gotten ruined, added some AI auto categorization etc I would have considered a subscription
When I got my core replacements I left it by the door to see what she would say, a group message received a picture with “You got another one!?!?!” Or something along those lines immediately upon her arrival home
Mine doesn’t even blink or ask questions any more when Yarbo packages show up. Even big ones. LOL