Licensing and patents are some of the biggest reasons why Konami never made a major effort bring out many of their Bemani line of music games out to the West. There is also costs in manufacturing the peripherals and not to mention cultural barriers too. I mean I doubt many people would enjoy playing J-Pop/J-Rock tunes or original Konami in-house music.
Even with some specific Western releases of their games, they tend to be really crap and pale into comparison. DDR EuroMix, or Beatmania for the PS2 are huge examples. It was just so dated and far too late when it came out, especially when the series has been the much better and much harder beatmaniaIIDX for ages. Beatmania IIDX 16: Empress, being the most recent release since last Autumn.
And yes, Guitar Freaks and Drummania have been out long before all the Guitar Heros and such. Especially since GF and DM were able to link their arcade machines together.