So, I havn't been doing this nearly as much as some other people have but there is something that has been painstakingly obvious and that is how easy/hard things get when high level PC's are bored.
Let's say a group of us lower level players are hanging out, chillaxing, maxing, thinking we are cool when a DM comes online to do some random stuff. He/she sees a group of people roleplaying together and decides that "hay, some glazeebu right up their alleys would be awesome!". Now, things starts to get shaking and all of a sudden, Bigsword McHatemole comes walking in, ending up in the DM event and want/need (IC) to take a part of whatever glazeebu-slaughtering event there is. I have no problem with this whatsoever, in fact, I would probably want to act the same way as well if my name was Bigsword McHatemole. I mean, after all we all want some DM McLovin.
Now, here is what i'm thinking; having Bigsword McHatemole along is fun and all, but because all of a sudden, the horde of Glazeebus are only a minor nusiance and the rest of the party can be content with staying in the background throwing around the occasional Shuriken just to make it seem like they are contributing. This, right here, is where it becomes a snooze-fest for me personally.
So, the DM has a few choices normally. Up the resistance so that even Bigsword McHatemole gets to have fun, or keep it as planned and waste a couple of hours of his/her time watching Bigsword McHatemole plow through hordes of Glazeebu cannon fodder. Now, if the DM want's to make it a challenge, then every other player in the group is up poop creek becuse all those glazeebus all of a sudden brought their Daddy McPitfiend with them and a hit from that might be a challenge for Bigsword McHatemole, but it's permadeath for the rest of the people.
So, in light of this, I find it incredibly boring when there is no risk involved and when there is risk, it's often over the top and thus not a risk, but a death warrant. At such, I am at a greater length going to try to find an IC reason not to participate in the event. And again, this isn't supposed to reflect poorly on any specific player, but rather on me for wanting to enjoy the game to it's full extent. Sometimes, i'll find a good IC reason and opt out and sometimes I wont and probably end up falling asleep during the event. But it's as they say: "C'est la vie"...
I do immensly enjoy RP with each and every one I meet by the way. That is always engaging and fun, regardless of level so I hope to meet you all out there!
Good luck, happy "hunting", and see you around!

boom out.
EDIT: I had a talk with someone and this person pointed out that this text here was pointlessly aggressive and even though I dont agree 100%, it should be noted that if some phrases come off as aggressive, they aren't supposed to do that. I am not trying to hang out anyone or say that highlevels are always trying to hog DM-time and login just to take said DM time. I am sorry for any misunderstandings.
What I want to say is that too big differences in levels in groups is either boring for lower level players or too dangerous, if possible, I would like to encourage players to take note of this and try to be a part of a fun and rewarding experience for all involved
