FWIW, I am one of those people on the fence about this event (and really, all other PCA DE/TT events if the cost is the same) and it all comes down to cost/other options available. I did a couple PCA DE's last year and pretty much all the AX's. This year I am looking forward to doing as many DE's/TT's as I can, scheduling/$$$ permitting. However, at $385 for this first event and $375 at other events (no log book for later events) I have to pause.
One solution, since there really is nobody running in my class for TT's, is to just run the DE...however, I would like to get timed as a reference but I am not going to pay $55 more for a transponder and timing fee to do so. This option to just allow us to run a DE format is a good idea so good job on adding that feature. Doing this brings the cost down to $330 (am I right in assuming I don't need a transponder for DE only???) which is at the high end of doable for me but I will only do a couple events at this cost.
A second solution is to run with POC, which through my research is significantly cheaper for an equivilent TT event. The rub...I really like the PCA "family" and would not even question doing their events if things were more similar in cost...we're talking around $100 difference. To comment on what Kary said (who I think has some helpful suggestions and nice taste in cars

), I know racing is expensive and $100 is nothing in the grand scheme of things but I don't think that is the issue here...it's more a question of why would I choose to pay $100 more for virtually the same thing I can get elsewhere.
My point...if the cost of a PCA event was closer when compared to an equivilent POC event I would have already signed up. I would very much like to run with PCA and the DE/TT program could have my $$$ added to at least 3-4 events if the difference in cost was not so high. If POC can do it better (cheaper), then lets look closely at how they achieve that result.
I realize I am just one voice but my hope is that if there are a few more like me that raise their hand it might help allow the DE/TT chairs to make some adjustments and convince me and others to sign up. Nevertheless, thank you to those that work so hard to even make these events an option.
Lastly, to comment on something already mentioned, if costs would be significanlty reduced by doing joint club events (PCA/BMWCCA) I think this is worth looking into and I've all for it. In the midwest (Kansas City), where I moved from a couple years ago there is no such thing as a single car club track day. Each major club "hosts" an event or two each year at the local DE track and all the other clubs are invited. Everyone plays nicely and it really is a matter of necessity to have everyone invited to keep costs reasonable so everyone is grateful for the other clubs' attendance.