There really is a map that increases its bpm with every beat, while the draining time is only 1:57, the bpm rises from 100 to 573 like a rocket. The map is pretty interesting though, so here's the link if you are interested:
http://osu.ppy.sh/s/18315I guess you're pretty much talking about the same thing, so I'll tell you it's not practical to make every map like that one.
Rising the bpm slower could avoid this, but it's much harder to predict, especially when the
overall difficulty of the map was set to as high as 9 or 10.
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