Suggestion: more items to buy and market idea

I have an idea/suggestion. I know the rule, you can't sell items out of creative but I would like to buy some items which you can't craft.
A builder could build a black market for those items or expand the shop at Nimbay.

I would like to buy:

Whistle
Crystal ((758) from CustomNpcs) all colors
Placeholder ((587) from CustomNpcs) all colors
Maybe some clothes from CustomNpcs 


Bottle o'Enchanting 
Name Tag

I don't care if all those items are really expensive. 
Keep in mind this is a idea/ suggestion maybe other people have some suggestion for other items.