Let me say it in simple words that ANYONE can understand.

" NOT VERY MUCH "

For all those wii games probably 50 bucks.

and for the gamecube........
most of those games are old. and even though they are fun. gamestop will give you dirt. you will probably get under 50 dollars for all of them. they will only pay you a few dollars for each. if you really really just want to get rid of those games already and sell them to gamestop. ok do it. but don't sell resident evil code veronica to them... they will give you practically nothing...when it's actually the rarest of all of them. well it's rare for gamecube. it can be easily found for dreamcast. but the gamecube version is worth atleast 30-40 bucks. take a look here http://product.half.ebay.com/Resident-Evil-CODE-Veronica-X-Game-Cube-2003_W0QQtgZinfoQQprZ10670