It is in reality hardly a sought after profession
But one confined to families. Not even lay brahmins
And they are not lay Smarthas(Iyers)
Similarly most pAncharAtra priests in Sri Vaishnava temples are not lay Iyengars
Often these groups dont even marry Smarthas
But what I said is most definitely true for the temples in TN
How can you call 5% of the country's population "priestly" when less than 5% of them are engaged in priestly activities?
Descendants of a bunch of internally exogamous but mutually endogamous Indo-Aryan clans that originally inhabited the Punjab-Western Doab some 3000-3500 yrs ago
Ofcourse they have married local women along the way, while maintaining the ethnic identity along the male line
Period...
E.g. the Bhagavad Gita goes to great lengths to associate varNas with GuNas and SwabhAvas
But to me, these are post-hoc rationalizations