That "Gypsy Magic" spellbook is a FAKE
I don't have one specific book in mind; all of them deserve the same treatment.
A real Romani witch would never share her secrets with strangers on the internet. Or anyone outside her family, for that matter.
Witchcraft is one of the few Romani trades that gets passed down matrilineally. A man, Romani or not, having access to that in any form is seen as incredible bad luck, both for the man and the woman who let him access it.
(Of course, men could be on the receiving end of a spell, they're just not allowed to know the nitty-gritty of it.)
Also, a lot of Romani witches would never share their craft with non-Roma (due to a myriad of reasons, but a lot of traditional Roma still practice cultural self-isolation).
2. Put yourself in the shoes of a witch who knows prosperity spells. Why would she reveal her secret wealth spells so that people may do it themselves rather than coming to her?
For a long time, Romani women had no other choice than to sell their spiritual craft. Be it because it was too dangerous for a woman to work alongside men, discrimination, or because they weren't allowed to be legally educated (by the government, their family, financial troubles, the list goes on).
Nowadays, it's rare to see a Romani witch selling her labor (at least comparatively to past decades). This is due to several factors, among which are increased opportunities, both for women and for the Roma.
Romani women have never willingly shared their craft with anyone outside their family (and it's often performed in extreme secrecy). They see their craft as a blessing that is theirs alone and cannot pass it to anyone besides their daughters, nieces, and female relatives.
They wouldn't forsake the core tenet of their culture for $2.99, or whatever that PDF costs. If you've ever read one of those, you'll quickly realize that it draws inspiration from Wicca and Western Paganism, and Romani witchcraft COULD NOT be more different.
I guarantee you with 100% certainty that the books claiming they're "real gypsy magic" are LYING through their paper teeth. I have read a good amount of them, and every single one was pure bull. Wicca and European Paganism is NOT Romani culture and it will never even come close. They're insulting both by pretending they are even remotely similar.
You're being lied to by a money-hungry gadjikano seller who knows nothing about Romani culture. Spend your money on something else.