I'm sorry, but I still can't believe how little people know about this game sometimes.
Grouping is absolutely possible, and nets just as good, if not better, SP than behests and leves. The secret is in doing research. Linking leves with high numbers of player is all well and good, but I just don't have as much fun doing it. Talking about 150k SP per reset on leves to me seems quite rare unless you have a big group who all abandon and save the good ones. Group SP grinding will net you a reliable 50k SP/hr and sometimes more in higher levels. I'm not saying don't do leves, but peppering them in with party grinding is ideal... and if you're like me, the good ole' fashioned camp grinding is a lot more fun.
Different types of mobs have different SP modifiers, some are incredibly low, 50 or so, and in higher levels you get up to 150-200 base modifiers. Mobs with 150 base modifiers net over 400 SP to a full party, even more for light parties, provided the level difference is 10 or greater. 200 base will break 700-800 SP for groups. You can find calculated charts of all mob types, and then grind on the best mobs.
When you are 20, I'd recommend taking a trip to Mun Tuy Cellars in Gridania. In the northwestern quadrant, you will find a room of lvl 30 Gnats. Tons of them. While they only have a 100 base modifier, the SP gains are incredible for a party of 20s. The beauty of this spot is that there is a room full of Wights right next to them. When your group hits 23-25, move to the other room and chain pull lvl 35 Wights. These have a 150 modifier and can take you all the way to lvl 30. The best plan is to pick up Mun Tuy leves, chain pull until you run out of mobs or just need a change, then do your leves until the rooms respawn.
Another awesome mid-20s source of SP are the Ahrimen (Cursed Eyes) in Nanawa mines. These are often over camped though, Mun Tuy is a lot more private. These are lvl 35 with a 150 base modifier, just like the Wights. Mixing in leves is ideal here to break monotony.
In your early 30s, all the way up to lvl 40, Efts are your mob of choice. 150 base modifier, and there are camps of them all over Gridania. In our high 20s, low 30s, we chained these in Tam Tara, (r40-44) and eventually moved over to the groups by Nine ivies. There are only about 4-5 per camp, but the respawn is amazing, and you'll have plenty of Buzzards around to kill in-between for a 100 modifier.
At 35ish we moved to the Efts (r46-49) in Treespeak, also Gridania. From there it's on to Raptors in you high 30s, low 40s.
Looking at charts, doing research, and spending nights exploring pays in dividends. You'll find excellent mobs to camp and excellent spots. There are plenty of other places and other mobs that will net you tremendous rewards. I am still shocked that all of our SP camps are always empty, and there are 20 people standing around doing nothing waiting on behests.
Don't listen to people about parties being non-existent. The game was designed with several camps in place, and an SP system that is very conducive to chaining SP from certain types of monsters. Mixing in leves and behests when they are available is great too, and camping monsters is excellent when the LS is out of leves to link.
Edited, Jul 3rd 2011 11:32pm by lthompson