Remember all the fuss when Yamaha's crossplane YZF-R1 became the first Japanese litre sportsbike to have a price tag of more than £10,000? In 2009 it caused a huge kerfuffle, with everyone asking how Yamaha could justify such a hike in price. Fast-forward to nowadays – if you want a Fireblade SP, it is £23,699. Should you be considering the new Ducati Panigale V4 R, you will need to find a cool £38,995 down the back of the sofa. And super nakeds command the same phone number-sized prices with an Aprilia Tuono V4 costing £16,350, a Yamaha MT-10 £14,320 and a KTM 1390 Super Duke R £15,299 – and they're the base models, not even the high-spec versions! Okay, there are a few bargains, such as the £10,099 Honda Hornet…