When I was first collecting - for the first 8 - 10 years (when the fantasy bags starting coming out - late 90's, early 200 time frame), I did collect those type of fantasy bags. The person that made the types you linked to (and I did not keep track of the name so not sure if same person but bags look the same) did a very good job on them - nice printing, good quality headers and bags and the marbles were good quality marbles. But, they kept proliferating and even bags take up a lot of space so I quit collecting them. The person keeps up on the latest "hot" items - like the latest Ghostbusters movie - and has kept them coming. My last count, I had about 270 of the fake and fantasy bags and some duplicates, too.
A little side note - on some of the earlier bags (and ones now probably), they also used Mega/Vacor marbles. Can you imagine finding a fantasy bag with some advertising name like these bags and having it full of early Michelangelos? 25 to 28 of those beautiful marbles that are selling like hotcakes now.