Thanks for the feedback Josh. Unfortunately as you pointed out, this is something we are currently discarding. We are working on some significant back end performance enhancments that will allow us to store significantly more data and we will re-evaluate this at that time. I opened a feature request to track this for you. http://thwack.solarwinds.com/ideas/1195
Thank you for confirming this. May I suggest that Solarwinds also 'keep' the TCP flags (which I believe are also discarded). These flags are part of the Cisco NetFlow V5 record (NetFlow Export Datagram Format [Support] - Cisco Systems) and provide valuable information.