If the camp can support more than one party, I'd say it's fine. I'd say that if they party currently there can take up 7/10 mobs before repops, what's the point in staying anyway? If you can virtually clear a whole area before the majority respawn, you need a new challenge anyhow.

Coming in on top of soloers is iffy. I tend to take up a whole group of mobs at a site when on DoM, and I'll admit that I don't like it one bit when a group comes in on top of me (or even another soloer for that matter). But, I suppose in the end the needs of the many outweigh the needs of the few.

Intruding on top of PL groups? All day long!