> a few 555s to drive your motors aren't going to make the difference between feasibility and infeasibility It depends on current market of considered niche. F

> a few 555s to drive your motors aren't going to make the difference between feasibility and infeasibility It depends on current market of considered niche. For some cases, market price is so low, every additional hole or trace on PCB could kill economy; for others, could include something like SGI or Cray as controller (mean, something severe overpriced) and it will be still profitable.