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Space is starting to look like the better mining operation
(arstechnica.com)
This is a most excellent place for technology news and articles.
I can pretty safely assume that the $0.18 figure does not include any measures to contain and reduce damage to the environment done by that trash. The entire point of dumping trash in space would not be that it's cheaper it's that it would be overall better. General rule from life experience is that cheaper usually isn't even close to acceptable in all other parameters.
But yes as things stand now sending trash up is not economical, however by moving industry to space a lot of the trash gets produced in space though so there would be less to shoot up in the first place. Particular heavy industry pollutes like crazy and would benefit from not having to worry about their toxic goop poisoning everything around it.
To add to that, if possible trash should always be recycled. Bio waste can do bio things (I'm not a biologist, idk), Minerals can be reused, and so on.