I'll add some of my suggestions, some have been said but oh well, just read over those.
I know only one or 2 "higher valuable" are in the compass at the same time, so I don't expect to see these items anytime soon or maybe I'll see some never.
- a costume set box (like Fusion, ravenstorm,... set)
- dragon eggs are always wanted
- dragon shard socket key
- dragon shard extractor
- force locker and unlocker
- basic strengthening crystal
- co-op scroll
- shadowstep scroll
- attribute removal crystal
- transfer demon crystal
- summoning scroll
- transportation rune
- miraculous costume transformation elixir
- dragon training whip
- academy knowledge enhancer
- dragon essence extractor
- maybe even some housing stuff, dragon statues for instance
- looting pet
there, some basic and other non-basic stuff that should give you some ideas maybe?