The discount is small, I agree. But it's always worth it. It's riskless if you have the cash anyway.
And regarding having cash: if you set aside the full amount in cash at time of purchase in order to reduce the risk of not being able to pay the rates, then you did win absolutely nothing. Opportunity cost of not having that cash available for profitable investments in case of paying in cash is what could possibly be the reason for the credit variant being cheaper in the end, but that of course depends on you investing the cash and divesting just when it is necessary to pay a rate.
[1] https://www.mysynchrony.com/mysyf/paymentestimator.html?intc...
Then I got smashed with a HUGE interest charge, they charge you ALL of the interest from the 18/24 months at the end of that time if you have a blance
I buy $300 couches from the clearance center now, in cash.
Ikea, and nearly any reasonably sized furniture store, has a financing arm. So I assume it's common (and a money maker).
Thing is, often these places offer 6 months interest free and what not, so as long as you pay off your debt in the allotted time, it's smarter than paying cash.