Is spending money on a minor haraam considered extravagance that necessitates it being counted among the major sins, or is spending it considered among the minor sins because the haraam is minor?

Ibn Hajar al-Haytami considered spending money, even a small amount, on something forbidden (haram (definition)), even if it was a minor sin (saghira), to be a major sin (kabira). He justified this by stating that it constitutes foolishness (safah) and extravagance (tabdhir) that necessitates interdiction (hajr) and disqualifies its perpetrator from giving testimony or holding guardianship, which indicates his moral corruption (fisq). The fact that it is fisq makes it a major sin, just as the degradation of the self by spending money on disobedience indicates complete immersion in the love of sins. He added that lighting lamps on graves (israj 'ala al-qubur) could be a major sin if it involves extravagance and wastefulness (israf wa tabdhir) and spending money on forbidden things, or if it offers little benefit to the resident or visitor while resembling the Magians.