It's not weird - I too justify my purchases on some occasions. I've looked at stuff and gone through a similar thought process to your own and I also find it helpful sometimes to get a second opinion. I can think of situations where I've been chided for
not purchasing items that were rare/relatively cheap or both.
Yeah, I'm single and a grown adult - I don't need to explain my decision-making in this regard to anyone, especially as I run a very tight ship financially and do my best to live within my means. I remember a conversation with a fellow record collector that I'd crossed paths with at shop one afternoon.
We took the same bus home and discussed our new acquisitions and he was anxious about the reaction from his spouse to his latest vinyl purchases. He mentioned wanting to pick up a reel-to-reel machine and create compilations of his favourite music but was fearful of how this would be received at home. I looked at him with bewilderment because I was unable to fully comprehend his predicament: providing that his actions didn't affect household priorities, that was his money to do with as he saw fit.
In theory, anyway...