In this economy should a guy ask a lady if discounts are available for dinner dates? Recently after a multi hour date my companion suggested we have dinner together. We both enjoyed our extra time together along with a great meal. The cool part, there was no up-charge. Since then I have cooked for her both prior and after our private time. If this is possible with other providers I'm sure I would date more often. Since bargaining is a no,no how do you bring up the idea?
Thoughts from boths sides of the fence appreciated.

First of all let me start by saying that your post is a bit ambiguous as you seem to be asking both about the appropriateness of asking for a discount based on multi-hour date and then later in the post, you mention the word, "upcharge" So, I'm sort of confused as to whether you are looking for a freebie dinner companion (before/after a Hobby date) or whether you wish to negotiate a better rate for a multi-hour date which would also include dinner, whether at your place or at a restaurant

From a legal stance, your safety position is that you are actually paying a lady (an escort) in this Hobby for her time and companionship. However as a Hobbyist, you are expecting some kind of sexual liaison during your paid "date" This statement is reflective of the reality aspect of the Hobby and frankly speaking, if some sort of sexual activity was not on the proverbial menu, there would not be much of a Hobby and it would end up becoming like a hit-miss civvie date.

Now with this precursor, it is understandable as to why some Providers feel that they should and would charge you for the "dinner date" and some decide to go out to dinner with you, off the clock. Usually, a Provider whom you have known for a while, both qualitatively and quantitatively would be more open to an off-the-clock dinner date than someone who you have never met before.

To address the last part of your post, while you are correct stating that overt bargaining is a an inelegant and crass approach to the issue, honesty and straightforwardness is also a commendable quality. Nothing wrong with asking a Provider if she would agree to a 2-3 hour date based on her own rates with a discounted additional 4th or 5th hour, purely for a dinner date (only if she does not have such arrangements already on her website or on her listings/postings). Then it is up to her to decide if this criteria meets her business requirements and standards.

M&G Special

I just came up with a few Holiday Specials where you can take me to dinner, out for cocktails, or just to meet at a caf'e for a cup of joe because I feel chemistry is everything, so why not get to know each other 1st?  

My choice of course & you pay the tab, but I think it is a steal of a deal if your a man who can indulge in great conversation with a young lady of my caliber in a public setting.  Maybe because I am only seeking a few select individuals to play with I am open to interviewing them per say in a setting that makes me feel comfortable. Plus, I feel at this point in my career I can afford to say I do not want a big chunk of $ upfront because I believe that I can be spoiled in other ways by my future friends.  
(Mutually benefitial relationship?)

Money is not everything, but I do see the providers point on getting paid for their time.  Let's Be reasonable because we should be enjoying ourselves as well!

Now my VIP Playdate tribute is not to be negotiated. LMFAO...........SMILE 4 ME!