What is SE stance in people selling runs?

[Venom]

Yup. SE officially doesn't like, nor endorses it, but they're only going to majorly concern themselves with cases where real world currency is getting exchanged for in-game services or goods. So long as it's all virtual currencies and services being exchanged, they ultimately don't care what you do with your gil.

Most content that you can actually buy a clear of and be carried through isn't terribly relevant anyway anymore - good luck buying a clear of Savage Coil or Final Coil, for instance.

So, technically if somebody is offering selling runs but isn't making it clear the currency is gill, shouldn't these players be investigated? It is real shady that people are discussing prices privately.