I don't know if anyone mentioned this but purpurea makes pitchers more slowly than most other sarracenia.
Just an update to this thread... My S. purpurea FINALLY started forming new pitchers at the beginning of July, and now there are a couple that are almost full size (one open) and a few more on the way. Last year's pitchers look like they're starting to turn brown, so maybe by fall I'll have a plant with all new pitchers.
Also, here's an updated shot of the hybrid I got, with 13 pitchers (including the ones just forming) instead of 4. The pitchers that formed after I got the plant and put it in full sunlight are shorter and stronger, and can hold some water without immediately flopping over. Still seems to most closely resemble S. x catesbaei.
It seems you also have another floater: some U. bisquamata.
My growlist: http://bit.ly/VUE0ri
Yep, those utrics actually grow so fast that they obscure the other plants, so I've been pulling them up lately. They just seem to pop back up and spread to the other pots though.