The LLLLs do not appear to be premium 4-letter domain names but the prices are around market rate. The NNNN is a separate analysis since this is likely a Chinese buyer or a reseller intending to target the Chinese market. One would have to understand the specific number's significance or the value of numerics in general to assess the price properly.
Do you think that those with large four letter and four number portfolios are bidding up these auctions to protect their investments?