To know for sure, you need to spend a lot of time collecting and analyzing data. Listen to some misunderstandings here, and I'll explain: My search for prefixes is in Hash-160 keys, and it's a sequential search of private keys. If you do the search this way and collect the data as I do, when you analyze the data you will see that there is a minimum interval between prefixes. For example: With 6 prefixes, the minimum interval of private keys is 5000 keys, but with 7 prefixes, the interval is much, much higher. As I said, it's necessary to think outside the box and question everything.
You'll get the exact same results if you analyze randomly generated data, instead of H160-ing sequential public keys.
That alone, should ring some bells for sanity check. If it doesn't, that's OK, you'll find a lot of friends here.
