it seemed a natural fit with my interests from when i was much younger in the critters around me and the plants i enjoy growing and eating to see what would happen if...
i started out with the goal of getting enough worms to keep up with the production of kitchen veggie scraps. it turned out to also be a good way to get rid of a lot of the paper and cardboard scraps.
compared to many people who have purchased special bins and composting worms i started out fairly low budget. also i wanted to do things a little different.
the first bin was going to be thrown away, the buckets used were recycled from a fast-food store or old construction materials buckets. the worms cost me a few $. the thread, cheesecloth and elastic i used to make covers for the buckets ran about $7. round it all to an even $20 max.
i could have used all recycled materials (old shirts and elastic from waistbands) and got the worms for free by digging and scrounging around the compost heap. if i'd gone that route i'd be out the $2 for thread. still, $20 is not bad for many hours of entertainment and the whole winter of having an excuse to get my hands in the dirt. :)
for normal people doing bin composting they end up getting a species of worms that does well in an all organic material environment. often called red-wrigglers they do well in a bin that has holes in the sides and drainage out the bottom for the juice from decay and digestion that happens when veggie scraps meet worm.
it has to be kept above freezing. and there is worm tea draining off. also the added air holes needed to keep the bins from going anaerobic increases the smell you would get. not that it is horrible, but even if it is noticeable to some people that would be a problem. this means the bins get kept in a semi- heated garage or the basement or outside on the back porch if the climate isn't too cold or hot.
our garage isn't heated, we have no basement, plus it freezes pretty well here in the winter. i couldn't get by with bins outside (the raccoons would love me) so i needed a way to keep the critters happy, keep the smells down and still have a system of veggie decay and worm digestion going on all within a few feet of where i am most of the time.