Funny thing, I knew when I wrote my comment that they would be at least one answer mentioning enthusiast with their fancy all carbon fibber road bike that cost

Funny thing, I knew when I wrote my comment that they would be at least one answer mentioning enthusiast with their fancy all carbon fibber road bike that cost has much as a car :) . While it i definitely true that expensive bike existed for a long time, enthusiast where rarely parking this type of bike in the middle of a busy city. These are the kind of bike who are always kept safely in a locked garage. Plus, the number of enthusiast who pay for this kind of bike are way lower. So not only is it more rare for a thief to come across this type of bike, they also might have an harder time reselling it, and reselling it is more dangerous because those bike are easily identifiable and the legitimate owner usually care enough about it to have made it registered. E-bike are just plain more common, and most people use them for commute which mean they tend to be park in places that are more vulnerable to thief and are easier to resell.