My take on this matter:
Any determined sign that falls onto the 2H cusp will indicate a will to make money. Doesn't really mean other signs can't make money though. The 2H will show us how we can best make money and our attitude to money.
I kind of disagree about Sag and Pisces being lucky with money. Sag can be too excessive with money, thinking luck is always on their side, and end up broke. And I often see red flag when someone complains about being unlucky with money and their chart shows Pisces on 2H cusp. Pisces doesn't care for material things and is also pretty spaced out, so money could slip out of their hand. Aries is impulsive and can burn up a large amount of money real fast. Aquarius can be unlucky with money, but it's because they don't really care.
I think Scorpio can be pretty lucky with money. Scorpio on 2H can mean obsession with material gain, so the chart owner could do anything for money. Capricorn is pretty pragmatic and it can very much be the number 1 sign for money, and also Taurus. Virgo is good at managing finance too (yeah right, earth signs are good at making money). Leo, Libra and Gemini are hit-and-miss.
Again, everything depends on the chart as a whole. Someone with a bad 2H may have other placements as a compensation.
P.S: I have Taurus on 2H cusp, Gemini Sun and Merc in 2H, and Taurus Venus in 1H. You can say I'm obsessed with money then