First off, congrats on those sales. We always say that just because a name is rejected on BB, it doesn't mean it is a bad name, it just means it isn't a good fit for our marketplace.
In regards to your specific example... G R I D L Y T I C is a nice name because 'grid' is a fairly popular tech keyword, and 'lytic' is short for 'analytic' which is obviously a huge sector in tech these days.
C L E V E R B O U N D was rejected because we don't see the connection in the two words. While 'clever' is a decent keyword it would need to be paired with something else. Say like 'logic', 'cloud', 'bot', etc for it to make sense.
F L I R T W A L L E T was rejected for a similar reason. 'Wallet' is a very nice keyword nowadays, but 'flirt' isn't a good match. Something better that would work with 'wallet' would be 'tech', 'cloud', 'bit', 'coin', etc.
Hopefully this helps. Let me know if there is anything else I can help you with.