Almost everyone I know who considers music a hobby ends up spending a pretty good penny on it once they really get into it. It can easily be one of the most expensive hobbies someone has (it is for me at least). Once you've learned the basics, half of the fun is collaborating with others or recording.
Costs:
- Instruments & accessories (serious guitar players often have at least one acoustic and one electric - and good quality ones are going to be at least $500, but could go way higher. Other accessories: at least a metronome and tuner, potentially also some pedals, amps, drum machine, etc)
- Renting/owning/traveling to a practice space if playing in a group
- Educational material: Lessons, Books, sheet music, music apps
- Recording / mixing equipment
Sure you can get a used acoustic guitar and watch youtube videos to learn it - but I don't know many people who do that and stick to it.
The real up-side though, is that decent musical gear doesn't lose a ton of value over time unless it gets broken or stolen. Also, if you're not professional, you can pace out your purchases.
My personal collection grew over 10 years, and is just for amateur use, jamming with friends mostly. I've got a couple guitars, bass, keyboard, 2 banjos, amps and mics. When I add up everything I've spent, it was probably 2/3 the cost of 10 years of $100/mo cable. I wasted a decent portion of that cost on a few other instruments I never played and ending up giving away as gifts to friends though.
Most hobbies have a cost and time length of enjoyment and thus you can determine how much you are spending per hour of enjoyment.
Movies is like $25 an hour, though skipping concessions and going to a cheaper theater can bring it down to under $10 an hour.
A short video game (assuming full price release day) is like $7 an hour. (Cost is higher if you play games less because the upfront cost of the system is split over fewer games).
A long video game is goes from $2 an hour to $.50 an hour, and can go much cheaper for games you enjoy for extremely long times.
Books for me are around $2 to $.50 an hour ($20 book that last 10 hours to a $10 book that lasts as long). Libraries make all of this much much cheaper if you have one.
I actually read a lot of web novels/fan fiction which are generally free and thus my only cost is for the internet access that I'm paying for anyways.
Sports can be a lot harder to measure because there is a large variance in the costs depending on numerous factors, but I would assume they aren't that much cheaper (though generally much healthier for you).
I find art, especially for anything that is above crayola level brand, is quite a bit more expensive. So for kids it is cheap, but for adults who spend any serious amount of time in it, the costs go up pretty fast.
So in comparison, $1 an hour for TV isn't bad, but it is filled with ads. So many ads I personally refrain from TV.
Books, sports, art, music, are all way cheaper forms of entertaining oneself.
Most hobbies or entertainment don't have a charge per hour.