I'm in the bunch that should have just bought my diapers, brand new, with embroidery, custom made to save me some money. I've invested ina sewing machine, embroidery machine, serger, a snap press, TONS of organic fabrics, TONS of wool (yarn and interlock)
Seriously, I could open a store. BUT it's become my hobby, something I LOVE to do, so it's totally worth it to me. I just like to make them, experimenting with patterns, abfrics, combinations, ect. I've learned a valuable trade (sewing) because of it.
I totally think even if you went with organic fabrics and fancy thread, elastic, and hook and loop, you could save money. If you use recycled materials, you can sew a stash for free. Flats or prefolds with recycled flannel or t-shirts would be free, and for a few dollars for some elastic and aplix you could make fitteds for pretty cheap too. And fabric store fleece makes a great AIO/pocket/soaker/longies/shorties. I double up in the crotch area, and it works wonderfully. HTH