If renters wanted to pay more, they could probably have this deal with any number of landlords. It's not common because renters aren't looking to own a part of

If renters wanted to pay more, they could probably have this deal with any number of landlords. It's not common because renters aren't looking to own a part of that house/apartment, they're just looking to get by until they can actually own one themselves. How is it better for them to be forced to put money into that residence rather than in a savings account that'll go toward the residence they actually want to buy?