Here is my take on this. Sure, it can be used for piracy, but there are a lot of other reasons people hack their wii. And I bet a quite a few people pirate games from different regions, which are unavailable in their country for different reasons(like I know my friends friend got a copy of PAL Pikmin 2 Wii, because there wasn't a NTSC release. Anyway, here is my list of why people hack their wii:
1) Backups. First, it makes things easier having all your games on an external hard drive, USB read speed is better than optical read speed, cheats, modified games...
2) Disk launchers (Neogamma, Gecko OS,...) Allow cheats to be used with RETAIL disks.
3) System Menu hacks, such as block updates, turn off Wii menu music, Auto press A at health screen, region free everything,...
4) Media Playback, such as dvds, and viewing other media with programs like
wiimc
5) Homebrew-there is a lot of poor homebrew games out there, but there are a few really good ones
6) Changing the color of your wii menu-some people think it looks cool
7) Copy the "Uncopyable" save files
8) back up your gamecube save files from your memory card.
9) Last, but certainly not least, Mods for games
There are so many modded ISOs and mods for games that make them a lot more fun. I mean, look at Kitty Corp: Meow Mix's Brawl Vault. (I'm not 100% sure that the site does not contain links to copyrighted data, so I cannot provide you with a link at this time. If it does not, I will add one. In the meantime, just search
Brawl Vault on Google. Its the first link.) You can take worthless characters and stages *cough*
Wario, Rumble Falls *cough* and other parts of the game and add more and better characters, stages, custom menus, custom music, customized attacks, outfits, characters from other games, ... The list goes on and on. The number one reason why my friends had me hack their wii was JUST for brawl hacks, nothing else. It can improve on a game's mechanics and make it more fun. I hacked their wii about 2 or three years ago, and we still play with brawl hacks. I can't believe no one had mentioned this before.
There are probably many other reasons that I have missed to hack your wii. Oh, and
tdub154420, you obviously have a very narrow mind about this whole issue. Next time, do a little research beforehand about what you can do with a hacked wii. It seems like you are one of those people that claim "its illegal" whenever someone talks about hacking, without understanding the whole situation.