Steve,
I have observed consistently the last 3 years that flowers dominate the first 2-3 days, and then the veggies start going better.
Heirlooms, organically grown, non-GMO, new intros and odd items tend to go first. Certain seed companies will help "sell" your packs. Be sure to record your seeds' special attributes in the comments. Things that weren't offered last year are more sought after, generally.
Offering just one pack often lures us into a wishlisting/dibbing war.
More can be added later, so all can get some, but meanwhile that first one may be good for a third or quarter of a ticket instead of a tenth of a ticket.
