Conference fraud

The Guardian reports that the UK is becoming more cautious about granting visas to students and academics because some people are registering for academic conferences just to get into the country:

Universities holding academic conferences are being targeted by bogus overseas applicants, who are just looking to obtain a visa into the country, Education Guardian can reveal.

The bogus applicants attempt to register to attend conferences at UK universities in the hope of getting a letter from the university stating they are expected at the event. The letter would bolster the bogus applicant's request for a visa into the UK.

Okay, but say you're a grad student from a legitimate university with a legitimate advisor who thinks you will be at the conference -- but really you are only going to attend like one panel and then spend the rest of the week partying in Europe.  That's still okay, right?