The tires that come on the Lexus are perfectly fine tires assuming they're the Michelin MXV4. I spent $600 on a set of them of my own choosing to put on my Lexus, my dad has had 5 sets of them on the two LS' he's had. They come OEM on many, many cars including cars much more expensive than any Lexus. They were OEM on BMW's 7 series, the MB S Class, BMW's X5.
Treadwear is not the only...or even the most important measurement of a tire's quality. My opinion? You won't find a tire that will last 40k and retain the ride and noise characteristics the Lexus is designed for. That comes from TONS of experience buying tires for these cars. I'm thrilled if I get 30k on a set of tires. As for the tires on your Camry not costing as much. Why not? They're exactly the same size tires. The ES uses cheap tires, replacing them is no big deal. Its not like they're $250 a peice 19 inchers. Wanna see short treadlife?
Anyways when you bought the car there was a big sticker "WARNING, LOW PROFILE TIRES MAY EXPERIENCE TREAD LIFE OF LESS THAN 20K MILES". How can you say you're surprised?
Do I have a financial stake in Lexus? Absolutely not. Its true I do defend them when I think people are being unreasonable, but look around at some of my posts. I've RAILED on the ES350 in this forum to the point where people have become quite...tired of reading my opinions. I and others have become tired of the incessant whining of some owners here about stupid things like low treadlife and how they're going to sell their cars because of it (which would be an abhorently stupid thing to do). And I absolutely never hold back my opinion, so get used to that.
I mean there's one guy saying Lexus should step up and fix his failed LCD and his broken window switch on his 17 year old LS400. Thats sheer lunacy.
Even if I did have a financial stake in Lexus, do you really think some postings on an internet forum would have an effect on the value of my holdings? Come on.
I have a lot of experience with these cars and I believe in them. They are excellent cars and when you drive them with 150k on the clock and compare them to other cars at the same mileage the difference is stunning. They've definately had some foibles with the ES350, but I have no reason to believe it will be appreciably different.