0% is marketing hype? Uh, no, not if you can do very, very basic math. Heck, you don't even need to do the math yourself - there are dozen's of free online loan calculators.
There's only a few important #s to enter: Purchase price, loan term (length in months) and interest rate, and amount of down payment, if any. Of course you do not compare tractor purchases by only looking at the manufacturer's offerred finance rate.
I'm guessing none of the brands at your dealership happen to be offering 0% right now? Bummer.