Imno also explains well what I said in my other post above, the botfarms that were created by the thousands were done when it was taking 7 days to get back the 10$ on the account from rewards cards dumping. After that they were positive until they tanked the market.
Then they left for the most part, and their accounts are still sold as of today to people that run bots in wild and invest in them, but in way less quantities as it currently take months not only to get ROI, but to stop loosing money on them. Yes, a new bot activated today is a 90% loss for 6 months minimum, that should tell you they are not so detrimental to the economy.
If anything i'd LOWER the price of a spellbook to 2-3$ as it serves zero purpose at 10$ currently with so many cheap accounts flying around for the people in the know to use.
I personnaly would lower it to 2 or 3$ as even at that price no bot farm could take advantage of the price and there is better out there for them. It will also make sure there are more real players entry because low price = more entry.
Don't know where you got your theory where high price in a shit market = more customers but it's factually wrong.
Apart from that, i'd obviously monitor the market price, and readjust the price of the spellbook accordingly and dynamically.
If we were with crazy price once again the price should go higher and higher and be calculated over the SPS price, as the rewards cards are now locked and cannot enter in that calculation.
But for now, 10$ is too much, more than that is suicidal.