The price of a single book is still under discussion; while each aristocratic family has a mental estimate, it hasn't dropped below ten thousand coins.
After all, even though Chen Xi builds schools, he doesn't give away books for free, so the aristocratic families calculated the price of the petition. According to Chen Xi's investment method, the estimated cost is eight thousand coins. Of course, purchasing it at two or three tens of thousands is indeed somewhat exploitative, but the aristocratic families don't find it too expensive...
Knowledge is wealth, and this is a shared belief among the aristocratic families in the Late Han. Spending tens of thousands of coins on books is still quite acceptable to them.
Of course, on the premise that they don't find out the real cost is just over a hundred coins, and with continued efforts, it could actually press below a hundred coins.
