I spend a lot of time on the internet looking at funny stuff for free, and I no longer easily find things that invoke that kind of response in me online. In fact, the last time I saw anything online that literally made me laugh so hard I couldn't breathe was in 2007, and that was with company.

Even as a strong introvert, I find that a lot of humor value relies on the social aspect of having someone to share it with, so I will occasionally spend money to go watch a movie in the presence of others and share the experience with them.

As for catpennies, you can use the same penny on as many cats as you can find; the limiting factor isn't pennies, but novelty. Similarly, out of all my purchases I tend to get the most enjoyment per dollar out of video games, and I refrain from buying new ones as often as I could afford to because I suspect that if I bought them more often the enjoyment of playing a new video game would be decreased.