... Can someone explain this in Plain Belgian English (or Blonde English)?
Pretty much answered already, but a little more info at
mameDev FAQs... the big torrents. Why do those basterds only upload 20Gb collections in huge ISO files. Just share some small collection with classics too, or keep individual items selectable for download (not iso-ing it to one big file).
A little OT, and a generalization, and boarding on taboo, too, but anyway... The are those who like things bundled for them and those that don't (very general statement, and actually people are some of both, more one way at some things, more the other at others). Examples: those who compile their own mame, vs those who don't; point 'n click cameras vs DSLRs; brand name computers vs BYO computers; windows vs linux. I find that people who torrent usually like the files bundled. So the people who share usually shared their stuff bundled, which atracks others who like bundles, and so on with positive feedback toward bundled stuff. Meh.
(FWIW, IMO some stuff should be bundled, but it's too easy and too common to "over bundle".)