reasons from the top of my head...
- because it allows easily to know which are the Jpn originals corresponding to some US/Eur games, and viceversa
- because some roms are shared, for systems where we have been able to document proper multichip PCBs (like many NES and SNES games) and for systems with multi-disk releases where only a single disk have been modified across revisions
- because anyway MAME shares most of the loading code across arcade and home system roms, so that the support is already there and it makes sense to exploit it 
If more come to mind, I'll reply again 
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Re: Softlist roms - Why have split/merged at all?
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