IIRC, the "old" mtgox.com (non-socket) API had some "query it 10 times and get blocked for 24h" policy.
Are those limits lifted for the new data.mtgox.com API?
The limits are lifted, however spamming will still end in your IP getting blocked (not by us, but by CloudFlare, using their own method to choose to block you).
Either way getting the same data again and again will
not result in new data being returned, remember this.