No, I know exactly what you mean I just disagree. I disagree with the notion that they should reward you, or that there should be content added in future DLC to enhance past DLCs as a proverbial reward for those buying the new DLC. I based everything I have said thus far off of your exact words.
You suggested that they should spend time on the new DLCs adding to those previously released so you would feel rewarded for purchasing the new stuff, I don't see any reason why they should go back and work on finished content just to reward you. I disagree because it isn't merely you feeling rewarded, it is you actually being rewarded with actual content simply for owning more than one DLC, that is where I disagree with your thoughts.
An example of feeling rewarded without actually BEING rewarded would be fan service. Slipping in little references here and there, or Easter eggs, those are a great example of the player feeling rewarded without being given something extra simply for making a purchase.
The entire Automatron DLC contained a lot of fan service that those who played Fallout 3 can appreciate. I still don't see that as being "rewarded" though, as if you look at the definition of the word... it simply doesn't fit.
You don't deserve additional rewards simply because you own Automatron and then purchase Wasteland Workshop.
So, I know exactly what you mean and what you are saying, I just do not agree with the sentiment. It always boggles my mind when people say "well, you just don't know what I mean" simply because you disagree. I apologize if my initial reply offended you, but this IS a forum and not everyone will share your views.
But if you personally feel rewarded that is great! I just don't think they should add more content to past DLCs as they work on the new ones, (which I am sure you will be able to enter your robots in the arenas that Wasteland Workshop will add.. but that wouldn't take extra work to implement) because I don't feel anyone deserves it, or is entitled to it.
When you make a purchase you are not inherently entitled to perks and rewards, I know today's consumerist culture taught us to think that way... but a purchase is a purchase, strictly business. You get what you paid for and then you move on.
As far as simply feeling rewarded due to something, that is a completely different matter.
Just to clarify this is what you had said,
"I would also like if each new DLC unlocked stuff for past DLCs. For example, Wasteland Workshop unlocks some additional content for those who bought Automatron, and those of us who liked Automatron will feel rewarded for buying Wasteland Workshop."
So you stated that you feel we should be rewarded with exclusive content for purchasing Automatron. Not only that, but you suggest that it should be done with every DLC, which is quite frankly nonsense. That means by this logic you expect a special reward simply for purchasing every single DLC. Not just the "feeling" of being rewarded, but an actual reward.
If you liked Automatron, THAT is you feeling rewarded for purchasing it. Your rewarding feeling for purchasing Wasteland Workshop.. is enjoying it! (if you do) THAT is where the rewarding feeling comes in to play. You connect the feeling with a literal reward just for buying DLC, which once again I disagree with.
Now maybe you didn't word it the way you intended, but I only have what you typed out to go off of.