I think this is a lot like HQ and FAQ suffixes on .com names. Some people don't like them at all, but there are people using them on live websites. I am not sure that I have seen anyone using the KB suffix to a name before, however. CryptoWiki.com, CryptoHQ.com, and CryptoFAQ.com might all be better names. On the other hand, the current spotlight on crypto currencies means that this is your ideal opportunity to sell a name like this. Strike while the iron is hot.