NameJet attracts many domain bidders for its exclusive stash of domains from Network Solutions; these aged domains are inherently more valuable than domains that dropped.
Competition among bidders on NameJet can vary, but typically it goes into the upper hundreds and well into the thousands.
At that level, one must be a verified bidder in order to exceed bids of $2,500 or more.
There is one more thing to remember, making it even more important to become verified at NameJet: The $2,500 limit applies to all combined bids one places, not per bid.
If you’re not aware of this simple fact, it’s easy to potentially miss important domain auctions, due to not being a verified NameJet user in the first place.
For more info, RTFM (or the FAQ) at NameJet.
