Buying a type rating is generally a bad idea. In some cases, such as Southwest airlines, they required a 737 type rating (that may have changed), but that was for seasoned, qualified pilots to begin with.
In the U.S., at least, having a type in an airliner does not relieve your employer of the onus of sending you to school anyway. The pilot has to complete an approved training course. This can get complicated, but at the root of it, a mere type rating gets you...nowhere, at least from what I know.
I've seen plenty of guys get types, mostly in 737's, to try to "demonstrate" to employers that they "can fly the aircraft." For whatever reason, the employers don't seem to care.
The conventional wisdom is that a type without experience in that type is essentially worthless. As cynical as it is, I have to agree with it. If you're going to claw your way up in aviation, better to keep your cash safely in hand, 'cuz you'll need it for food!