I go through outer wheel bearings in my 811 pretty regularly, but it's mostly because I hit stuff.

If I don't remember to put grease on the bearings before I put them in the hubs, they are a bitch to get out.

Those are the only bearings I lose with any regularity. As long as I change them when I see them starting to get loose, it's fine.

I have lost other bearings, but nothing consistent. A diff bearing or two and I think I lost one outdrive bearing a long time ago.