I don't get the camp system, in fact I kind of hate it.

[Ciaran Zagami]

Why would I build a pop up camp? Unlike past games I don't need it to fast travel to a given monster's spawn because quests can be started by just attacking it.

And since they can be torn down by random monsters it seems like just a waste of guild points.

[Kraehe]

Most maps, if not all of them, have spots that are safe for pop up camps to be build and monsters can´t get to them so they won´t get destroyed. These are usually a little hidden so you don´t find them by just riding the regular paths.

As for why, I start most of my quests from the map screen by now unless I´m already out and about gathering stuff and run into a monster I want to hunt.
So having different starting points can put you a little closer to your target.
Some monsters also travel really far when they switch location and a little fast travel can make your hunt a bit faster (though I don´t bother with that)

A lot of the safe camp spots also come with a couple ressources. Some ore, some fish or plants. So thats a neat bonus.

All that said, I didn´t bother much with camps until I was in the lategame because while they can be a neat little help, they are by no means a necessaty.

[Jason Eroge]

you dont need to repair them, they get repaired themself