Because people lie like on school catchment areas and to get married in a church etc etc
How long does someone have to be resident in cornwall to qualify?
What the difference % between residents and 'outsiders'? why do 'outsiders' stand to make greater profits when Cornish prices are capped?
To qualify, I have no problem with people buying houses to live in their community. The housing market is what it is and there are help to buy schemes for locals etc etc
I just think second houses are essentially greedy. I guess theres a socialist in me somewhere 
Im also getting a bit defensive in the face of seemingly endless criticism of Cornwall on this site in recent weeks!