I agree. There are lots of empty interactions like this. One of my (least) favorite is the guards that ask if I can enchant their sword for them. I would certainly love to, but uh... I can't.
Also, there are several shop owners that really really wish I would buy something so that they could afford to do [something]. I would be perfectly happy to finance that [thing] if there was a way to. One lady wants to buy a particular Inn. Why can't I loan her the money and watch the Inn change ownership?
Another lady wants to open a shop, then become a caravaneer some day (Ysolda). I got her the mammoth tusk, but nothing ever happens with it. Annoyingly, I wish I could help her set up a shop.
Birna, in Winterhold, wants to make enough money to move. I wish I could help her too.
A lady in Kyne's Grove wants a new mill, because she can't cut down any trees at her current one. I would loan her the money to do it if I could.
In Riften, the Light Armor lady wants to get out of Skyrim. She's rude, I wish she would get out. But alas, I can't help her either.
I could go on and on and on. I wish Bethesda would fill in some of these gaps.
It's one of my gripes with the game. I get it, its a hard life and all, but there are no 'happy endings', no matter what you do. if you need to find somebody's sisiter, she is dead in a lake, a husband, crushed under a rock in a mine. Oh by the way, I looted his body and you can't have any of it to help you out now. The only feel good momenst are from killing bad things, not from doing a good action.