Re: Listing Options
The current options you have for setting up how you want to charge customers to place ads are:
% of sellers ad price
Fixed Price per Ad
Price per category
Also, you can choose to charge for featured listings which means the ad appears in the featured ads slider for a set price.
One of the great additions to CP 3.0 which wasn't available in previous versions is that you now have the ability to create custom ad packs where you can set a price per listing at $XX for XX number of days..
Really this gives you plenty of options to choose from, although as I said, no bulk listing option at this time.
I hope this information helps :)