Of all the dumb things to need to repeatedly replace... toilet seats.  I replaced the garbo plastic ones about a year ago with wooden seats.  A while back the one in my bathroom ended up snapping at the back making the seat loose - so I replaced it (again), this time with a slow close.  Now the one in the downstairs bathroom broke - right in the middle of the one side - snapped the whole way across.  Thank GOD I was not the one using it at the time or my personal insult and embarrassment would be unbearable.  Let's be honest, I'm not tiny, but I don't think I'm break a toilet seat every six months fat.  That said, what brand do really really big people buy, because hook me up.  At $30-60 a pop this is ridiculous.  I will also note that in all of my years adulting I've never had an issue with toilet seats before; none have ever broken at the mount point, in the middle of an 'arm', and none have even wiggled loose.