Leveling up to a certain number in jobs should award you some extra meebles, just because. Of course, doing small milestones would become too spammy when announced. Maybe 10 then 25 then 50 and the meeble prize goes up the more you level up because it takes more time to level up more. Example: lvl10=2500, lvl 25=6000 lvl50=15000(not exact numbers) It would work for all jobs of course.
As a side note (might be too much), even adding achievements for other things in /jobs would give a nice touch of achievement hunter, such as placing 10k blocks with builder, fishing 500 fishes with fisherman, plant 10000 seeds, chop down 50000 logs, mine 100 diamond ores, or kill 250 bats.
Sorry, I typed this on my phone.