I know in one unit I rented, the washer and dryer were added to my rent. I'm sure others do the same. Only thing I thought was odd was the cost $15/mo. I imagine it would cover the costs of the machines (especially if you picked them up dirt cheap on craigslist), but if it broke I think there would be a loss for you. I'm not up on rent a center items. Do they require a deposit? Is that something you could do? If they break something that is clearly their fault, can you charge them the cost of the item? etc etc. I don't think its a bad idea at all if you can fill a need.