Worth it how? Money is a relative thing. If $75 a month is enough that you "worry" about it being worth it, then maybe it isn't worth it. It is worth it to me for a few reasons:
1) 2+ man quests are easily soloable
2) Most instances are soloable
3) Sheer power in battlegrounds
4) I have a sporadic play schedule that doesn't allow me to be an "active" raider

So, just put it in perspective. Don't be afraid to say "screw this, its not worth it".