I love my livery yard and have been there 5 years but in the past year, 3 of the regular liveries have had to step back for various reasons so all have got sharers. Each have multiple horses and some have multiple sharers per horse. In total, it's meant 7 sharers on the yard.
We are a relatively small yard, only 15 liveries in total anyway, so that's a large footfall of extra people, extra cars etc. A big impact when trying to use the arena as at any given time there always seems to be at least one sharer in there!
I've been a sharer myself for years so know there are some great ones - and a few of these are. But, with the best will in the world, lots of them aren't quite as respectful of our stuff because it's not theirs. And some of them feel like a bit of a liability as they're v novicey.
I guess the simple answer is, if I don't like it - leave. But just seems such a shame for longterm full paying liveries to end up pushed out because of the sharer situation!