I got a mortgage at 3% some years ago for an apartment. Since then we’ve had two kids and paid off a chunk of the mortgage with our monthly payments. At this stage in my life I’d absolutely be looking to convert that into buying a larger home and would be happy to pay a higher rate for it to happen. But not literally double, which is where rates are today.
The incentive you would have to offer would erase most of that $100,000 difference you pulled out of a hat.