Can you give some references that show wireless keyboards and mice are useful ?
Unbelievable! Do you really have no clue why, for example, newegg.com has more wireless mice (when all types are summed) listed than wired? Read rthompson80819's post. Then tell me, do you really not understand his reason - which is the reason practically all wireless mouse users like them - for preferring a wireless mouse?
There are ... overpriced ...
On average, they cost more than wired mice. The reason for that should quite obvious; they are technologically more sophisticated devices. Still, cordless mice at the lower end of the price spectrum are quite inexpensive.
There ... cause a lot of trouble. The does not have to be documented because nit is already widely know. It is common knowledge.
Not true. You have no evidence to support your statement and, again, the sales trends simply contradict your statements.