[toast0]

I think this makes sense. A lot of networks need a few addresses, so /24 - /22 is probably pretty active, and you have to justify the addresses, so someone who really only needs a /24 isn't able to buy a /21 and make it work; very few people need huge swaths, but those will be able to really use them and may value having them contiguous. In the middle, it doesn't make much difference having a /16 or two /17s or four /18s, so there's a lot more flexibility, and you take the lowest price per IP if there's a block you can use.