I don't think the tax authorities know what kind of black hole they are falling into. Say I have a business trip to the US in economy or plus. I then upgrade for points earned privately. My trip now yields substantially more points, but only because I subsidized the upgrade. What points get attributed to which accounts?

Maybe these guys should start looking at how the kids around Möllevången in Malmö can be driving around in the cars they have. More potential for sniffing out real tax crimes (not to mention real crimes of other types), but they know that Sven and Gunnar won't shoot them.