The poor economy has killed some of it. People who modify cheap econoboxes tend to have less disposable cash laying around than others. There is that, and most of these cars are just OLD as shit. There aren't very many clean ones left. You can't make the argument that Honda doesn't make anything tunable anymore. The rsx and current civic si are both great platforms.
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my rex has been busted into 2x in the last 5 months and they're parts shopping...have lived in 5 states prior to this and never had any attention on my rexes. i'm keeping on the down-low now. eff these thieving basterds.