I can think of a few reasons.
1. Many don't have much experience with them. I have several older Nicholson, half dozen Iwasaki, and a few riffler (budget) sets but enjoy woodworking.
2. Power tools are used in their place. An oscillating spindle/belt sander combo makes quick work for many or dremels. I turned a spindle with proper cove dimensions on my lathe for several balsa cranks I was making and then glued sandpaper. Could go from rough out to finished blank very fast that way with balsa.
3. For most bass cranks or topwater baits the size makes them sort of less ideal but still doable.
4. Youtube... so many build a bait however "Guru X" makes a bait.