Do you realise you just effectively argued against the existence of museums in general there (as every single artefact in a museum was originally a commodity of some kind, even if it was just a brick)?
Now toys are a commodity, but what happens 100 years from now, 200 years from now or further on down the track? What about those kids then?
That's the question which drives collectors such as myself. I collect MISB and MIB as well as loose for one reason- to see them go to a museum and be so tied up in legal red tape that they can never be sold, so that ideally 300+ years from now, some kid can go to a museum and see some of the pieces which sparked the start of the toy cartoon phenomenon, which will no doubt still be at the core of toy marketting campaigns for children in some form or another. For me, it's about giving those generations of kids the same enjoyment I had as a kid, and still have to this day.