I'm with Schmoe. To get that thing to "work" $$$ wise, you need to provide it as a service. You still charge the higher price, but offer a return policy when the owner changes cars ..and assure that there will be a model for them ..or their money back. Otherwise you can buy over a decade worth of filters for the money. There's also issues of "true" environmental gains. Sure you reduce landfill volumes ..but are you reducing pollution? What of the excessive solvent wastes in cleaning it? What are you as a consumer going to do with them??
I think the Fleetguard retro canister type deal is a decent alternative ..but it too will be too expensive for the average consumer to take advantage of. It will work for fleets ..taxi, police, state, local, federal agencies ..where environmental policy can carry the added costs and they, more or less, dictate waste stream/disposal policy.