hhmmm strange.. i tried it and this is what i've concluded:
before extruding from a curve, in the options box, you can get a max value of 100 divisions (either by typing in or ctrl+dragging the field). It won't go past 100.
however you can go to the extrude node (channel box) after the extrusion and increase this value beyond 100.
strange but seems to be what i can see...
thanks for your help mhcannon