Earlier quoted context omitted.
There are ways to detect scrapers and other bots if you really want to and services that do so.
Do you know the names of any such services off the top of your head? Thanks
Here is an open source system demo'd at BlackHat Europe 2011 (that checks it is a proper browser (with DOM/Javascript/etc), also good against DDoS. https://github.com/yuri-gushin/Roboo
Project Honeypot (scans inbound ips) good against spambots: https://www.projecthoneypot.org/
Here are some commercial solutions: CloudFlare's ScrapeShield -https://www.cloudflare.com/apps/scrapeshield
Distil Networks - http://www.distilnetworks.com/
Scrape Sentry - http://www.scrapesentry.com/
Fireblade - http://www.fireblade.com/