NPC Block Exchange

I would like to suggest a block exchange NPC at the outpost. I want to be able to take x amount of block A and exchange them for y amount of block B. Different types of blocks would have different exchange rates and there could also be a pixel cost involved.

Example:
1000 dirt blocks = 50 steal blocks

 

I still think this is a good idea. Maybe as an alternative to purchasing blocks with pixels.

 

Cool, I like the idea of having a store that doesn't use pixels.

 

Or... or
Do something like this
250 Stone Brick + 5 coal + 5 iron = 250 dungeon wall blocks

 

We needs this!