waves Me too. If a laner doesn't ward for themselves, a good jungler will ward for them. They don't like to do it, of course, but damn it, it loses games so bad if you don't ward, and some laners just don't realize this.
And of course it is not just the support's job to ward. That remains a terribly misinformed and desperately selfish assumption that some people still abide by, no matter how ineffective only three wards and a few trinkets are.
I used to get a Sightstone all the time as a jungler just for this reason (and started with a Lens, so I'd have an endless supply all game and the ability to remove as many wards as possible for as many successful ganks as possible). I still do get Sightstone sometimes, but otherwise I just grab a bunch of greens and a pink and throw them in their proper places near the lanes, if 75 gold is just unreasonable to them to keep them alive and prevent ganks.
You really do have to watch the kids when you're jungling. Some of them are good and considerate, some of them less so, some of them are grateful, some of them blame you for literally everything bad that ever happens to them. Heck, one time I lost a game as Skarner (and got an S in Mastery despite the loss) and my top-laner friended me just to tell me how bad I was and how I lost the game for him. That's an extreme example, but some degree of grief when someone absolutely needs someone else besides themselves to blame is just, you know, part of the role.
You get a variety of people when you're jungling, all with different loci of control.