There are 24 volt LED strips, they seem to be less popular and mostly used where extreme brightness is required, or perhaps very long runs of lighting. I have not looked at how they compare cost wise, in terms of lumens per dollar, per foot.

I find that most times the lighting I install uses strip lengths much shorter than the 5 meter length of one 12 volt LED tape spool. Running thin low voltage wiring between segments and back to the power source/controller, even when daisy chaining segments it rarely gets anywhere near 5 meters total LED length in any single combined run.

When using 24 volt LED strips the power supply must also match that 24 volts, as must the controller.