> deduct it via taxes (essentially spending nothing)
Unless you're positing some very specific, unusual situation, this isn't how tax deductibility works. The dollar amount of a tax deductible donation is subtracted from your taxable income, not from your tax bill. So you're getting a discount on the donation equal to your marginal tax rate.
Unless you're positing some very specific, unusual situation, this isn't how tax deductibility works. The dollar amount of a tax deductible donation is subtracted from your taxable income, not from your tax bill. So you're getting a discount on the donation equal to your marginal tax rate.