Maybe to address the pricing concerns you could make it more like car leasing deals that often allow to buy the leased car after the contract is over? You could rent furniture but with an option to buy at any time and terminate the monthly payments.
That's exactly what we're working on now. we should have more information about rent-to-buy options on our site soon, but in the meantime we're discussing it directly with anyone who might be interested in this.
Most furniture rental contracts do (or can) include this option.