I hope this works out well for them and they keep this option! I usually like only a few stamps from a large sentiment set and don't want to shell out for all of them.
But I can't see them offering this with more than a few sets. If they aren't going to have all the individual colors of markers available, they won't offer a lot of individual stamps. The issues about warehouse space, etc would apply to individual stamps too.
Cindy in Oregon