My opinion on this event.
The concept is ok, it just massively needs ironing out to become a legit event.
Holding the week after the YEC? Just stupid. Makes it so its never going to succeed. A lot of people don't even know it exists, because they think the season ends after the YEC (which it should). Something must be changing here. Stacey Allaster (WTA CEO) said the YEC is changing to an 8 day format next year, and will be Sunday-Sunday. The 2014 calendar on the WTA website doesn't actually confirm this yet (it's normally well behind anyway), but that would mean it clashes with the current position this is in. They surely won't hold them on exactly the same week.
The wildcards. They just cheapen the event. This year they have wildcarded in a player who is ranked 118 in the world. The 75 points she gets for turning up here, is the 2nd highest points tally on her ranking. There is also a chance that these 75 points get her into the Australian Open main draw for no other reason than she's Bulgarian. If you are going to have wildcards free to give to anyone, 75 free points is way too high.
The Sofia specific problem is that the event is too reliant on Pironkova. Last year it was a huge success. A big reason being Pironkova made the semi finals and won some matches, for her matches the arena tended to be packed. This year I think this event has maybe its best field ever, but I imagine it's going to do worse in attendance and local TV numbers because it's likely Pironkova won't even win a set. Indeed after her scoreline today, a lot of the locals have probably already lost interest.
Imo what should happen to this event. They should move it to the week before YEC. It should be mandatory for everyone that qualifies, it would get a reasonable field then. Too often players can opt out because they are in the Fed Cup final, an Istanbul alternate etc.
So for the end of season:
End Luxembourg and Moscow on Saturday (Luxembourg is already a Saturday final next year, Moscow is still Sunday)
This event runs Monday-Saturday
YEC runs Sunday-Sunday
Fed Cup final moves back a week (which has to be happening anyway, because no way will they run it the same time as the YEC)