There are probably some guidelines for that. That includes my time, not just my material resources. etc.
Also, when I argue against Tithing I’m sometimes accused of being against it just to save money. My response is that for some, tithing is not enough. But I see Christianity, compared to all man made religions, as a “spirit of the law” religion while the others are all “letter of the law”.
Thenin lies a place for a LOT of abuse by those who want to INCLUDE things the 'law' never intended.