Is there any reason a caster couldn't select the same Tradition as both a Primary and Secondary or as 2 Secondary choices when taking the Spell Casting Talent? This would be if they wanted an additional spell or two from one Tradition.

John

Logically speaking I think it's a stretch. Primary/Secondary is usually binary. As worded it doesn't use the word "other" traditions which would be clear. I expect that by intent they're not supposed to be the same. I don't know if mechanically speaking there's necessarily any harm in it though.

With a sweep of his hat,

Paul

I don't think any other selections in this system allow you to choose the same thing twice(W/O explicit instruction), why would this one be any different?

The selections must be distinct. If you want extra spells, the Learn Spell talent covers that.