Re: OOC Yes
One thing you two are missing is in the rules on these spellbooks it's called a preparation ritual. I will reread but if I recall correctly, it says you have to use three spells from the book with the spell book knowledge (what you call a ritual) and you must prepare three spells on the same host books list.
You don't need to use the same book, you don't need all the same spells, in fact it says you can even mix and match the books as you want (even saying you can put one books preparation ritual with another books spells).
However, the preparation is the key part. You prepare it along with preparing spells.
Guthbrand, yes but no. You are earning gold... Even a few gold coins is a lot. No, your earnings do not need to be representative of actual gold coins (it could be 4 gold worth of copper coins, or 400 copper).
Also, in the olden days entertainers went from city to city, perhaps performing for a few days before moving to the next... Much like modern theater. You are right though about much the rest, save that the spread of information is aided quite well by magic in Pathfinder... And there are modern tech and magitech civilizations in the year we play in (though, unfortunately, most tech and magitech rules are starfinder... !Yay lore without mechanics support!)
Anyways, there is a trade off... A balancing pros and cons, to these two eras in a rather interesting sliding yin and yang.
There is also that perform isn't really meant to be used frequently let alone impromptu. Most forums are of the consensus that it's meant to be like a concert or similar such performances.
The rules don't explicitly say this though and so I'm absolutely not going to force that. However, it, without a doubt, completely eclipses the profession rules.
And, by the way, the current 50 percent penalty is from a downtime event you rolled (and you have 3 more events I plan to roll out today). I didn't do the 50 percent because 'bUrN ThE Op tHiNg wItH FiRe!!!' like some ass hat GM's do. However, I feel that it is probably causing you to feel pressured and inspiring you to be resistant to more penalties... Please confirm if this is accurate.
If you handle that first event, the 50 percent penalty will go away.