You are quite right here and you are not alone with rusted spokes and other bits on Ten.

I got mine badly rusted, likely Yamaha did some job under warranty including front & rear spokes and few more bits (but they didnt accept flanking paint on my front and rear hubs, so I had to pay for powder coating them).

I was thinking of changing them to s/s at the time they were undoing and spokes and wheels. Asked a dealer for a quote for s/s set and it was something like �120 for a set ?!
Finally I didnt go for it and they replaced them like for like, but after just few miles I can already see some dark stains on them (not rust, but something is happening already)....very weak material....

It looks OK now, but I think at some stage I will do full new wheels including Excell rims, some aftermarket hubs and s/s spokes - price thought.