My gut instinct is that the primary reason Rituals don't get used is that they cost money, and players are greedy bastards who are loathe to spend money ever if they can finagle a way to solve the problem for free (which, using skills, they usually can), and would much rather hoard their resources to buy magic items.
...
If you want Rituals to be used more, just houserule a ritual point system, and I guarantee they'll be used. Players like using powers. If they have the option to use a ritual once a day for free or something, they'll take it.
Or, do what I do and just don't let players buy magic items (or residuum). Works like a charm.