Is it wrong that I'm thinking of not paying for my cat's necessities?
What is making you not want to pay for your cat's necessities?
I don't want to pay for it.
If your cat has needs, it is your responsibility to pay for the things that your pet requires. You should not expect someone else to take care of your pet. Not taking care of your pet would make you appear to be irresponsible.
I can't help myself, I get money and buy nice clothes.
It's important to be responsible when it comes to taking care of your pet. If you cannot do this, you should consider whether or not you're ready for a pet.