i think the 10k service is just an oil change and tire rotation. I don't think the 15k service is much more other than maybe changing the air filter. The 30k interval services are where it will start to get expensive.
You'd probably ought to tell the dealer specifically what you want done. The dealer's "10k service" could be substantially different from Lexus recommended 10k service.
Yeah, my local dealer wanted $165 for the 10k service (basically oil change, tire rotation, etc). I'm like, no thanks... Oil change only and I got free tire rotation @ NTB when I had my alignment checked.