1 (maybe 2 cause it has ab on it which can make it good for devastating De Rol Le with its special when it docks)
Here's the reason for its value:
"Quest Reward
A Vjaya with 40% hit can be obtained by talking to Elly after completing 6-5:Test/VR Spaceship 5 on Ultimate, while playing as a Hunter. Only one Vjaya can be obtained this way per character." http://wiki.pioneer2.net/index.php?title=Vjaya