I've had a couple of rejections now and asked just those things, but got crickets in response.
The naive in me thinks that "recruiters probably have massive inboxes clogged with inbound applicants and didn't see your message". The cynic/tinfoil thinks "there's probably a 'reject' button that once pressed sends the canned 'thank you for your time' email while setting up an email filter to send your messages straight to the spam folder".
I guess reality must be somehwere in between. What are your thoughts? Is there any industry standard in this, or is it really up to different recruiters in different companies at different times do different things?