By the time the "snotties" ( I hate the name) have been washed on a hot wash with all the water and detergent, and then somehow dried, exactly how ecologically friendly are they? Not to mention that everyone else close by will have caught those germs and be mopping their own noses and passing on germs.
It was the same with cloth nappies. By the time we'd flushed the loo with the poo and nappy liner (because that's what we did in those days), then soaked the nappy in a bucket of Nappisan, then washed them on a hot wash and got them dry - well, they were not good for the environment either, and also involved a lot of work. I can remember being exhausted at the end of the day and then changing the baby and suddenly realising that the $!$ bucket was full and that I'd got to sort that out before collapsing into bed.
Plus cloth nappies leaked so quite often the baby's vest and babygro would also have to be changed, and sometimes the cot sheets as well, so even more washing.