Good point pegasus. There is variation in some fares based on season "low" vs. "high".

Regarding SITI/SOTO, national regulations and currency rules are only part of the equation. For example, in India to purchase a OW/Star RTW tickets you need to use foreign currency or a credit card issued abroad. On the other hand, there are several fares that are only available when purchased in Indian rupees (with an Indian passport, though they overlook that a lot). I believe it is combination of individual airline rules constrained by the broad regulatory regime and IATA "voluntary rules".

The specific SOTO workaround I was referring to for * was based on one of the threads in the * forum on emailing TAs or even airline offices in South Africa wiring them money in Rand and then getting the ticket actually issued in UK or other countries.

I do not have much experience with this. In the case of OW I have done it many times and it is a nobrainer and an explicit part of the arrangement.