the dangers with eating them, like the link you posted suggests, are in eating the wrong ones or moldy ones or Amnita Muscaria which is not a Psilocybin mushroom.
once a week or once every 2 weeks is abusing?? I bet you think its ok to drink on the weekends....
every day use or doing them just "to get fucked up" and not for a true psychedelic experience is what I call abusing. most people do anything, like drink, just to get fucked and if you think that way with mushrooms then you are abusing them but there are many people that get more out of them then that.
sounds to me like you couldn't handle your trips to well
you won't catch me out roaming with grizzly bears on them either....
and FYI ... I always have a good trip!