http://www.clublexus.com/forums/showthread.php?s=&threadid=77237&highlight=LS400+service+cost
Check out the service costs for an LS400. Typical 60K service (miles) is about $900 or so, and 90K services run about a grand as well.
Also, check out the conversation. Lexus makes superb cars, but like any other flagship car sporting cutting edge technology, they are not inexpensive to maintain. People buy them in the used market expecting Corolla running costs. Those people should stick to owning Corollas.