problem I find with high bike tyre prices is it stops me trying other brands. I am reasonably happy with what I run so I buy it again as I can’t afford to buy a tyre I don’t like.
As for car tyres – the car tyre market is crazy. My car uses 195/55/15 which cost about 40% more than the slightly smaller 195/50/15 – that is down to economies of scale. The prices also change daily – in November I wanted a particular brand/model of tyre. They had been £66 each all year then went up to £88 over a couple of days. They then dropped to £50 so I snapped them up and the next day they were sold out everywhere. 2 days later they were back in stock and the cheapest price was £104 each!
Best tyres I have ever used btw: http://www.tyrereviews.co.uk/Tyre/Nokian/WRG2.htm
Dry, rain, ice, snow – nothing phases them. I will put the dedicated summer ones back on after Easter but I will miss these as they have transformed my car from being very nervous in any damp/greasy conditions to feeling like a brand new car.