John was grilled by the audience over this (I actually asked him the question directly) and he was quite open about it all. He has an A6 because he was given one for review (and joked he would only keep it if he got a good price on a now second-hand machine).
His reasons for having it were his daughter had to access certain Windows software. He personally found it faster for RISC OS image manipulation than his RISC PC.
He was very clear on his personal desire not to have to use Windows if possible. Indeed he explained his enthusiasm for supporting RISC OS arises partly from the selfish desire for a RISC OS market to continue so he can carry on using it.
I don't think there was any doubt in the audience about John's motives.