The one-time cost of an pellet extruder is nothing compared to the labour cost changing filament spools frequently , feeding this printer 24/7 from three or more 1kg spools.
A single motor hotend would have to be paused for every spoolchange, which can cause heat creep into the cold zone and clogged filament path's.
If you still want to take the spool-road, go for multi-motor extruders with individual runout-sensors and always have one reduntant drive. So you can change spools without interupting the print.
Also, using these undefined color filaments makes the idea of multicolor printing obsolete, because the outcome would be unpredictable.
