I think silk egg-hatching timer needs to be fixed before any silk curios are added. 8h for hatching is to damn hard to get around. Silk is probably hated for this annoying little factor. Its rare to be available to move the hatched eggs exactly 8h after you place eggs into tables. And you only have a 4h window after they hatch before you lose your entire silk line.
If the eggs behaved like treepots I would probably make these curios as well. But right now silk is just to damn iffy.