While official DLC is growing increasingly ridiculous in the way it fragments a video game, it would be wrong to write off the entire concept just because some publishers want to fuck you over for money.
Take fan-made content, for example! A group of European fans of adorable football sim Inazuma Eleven 2 have put together a "Remastered Version" update of the game, which reverts much of the title's localisation (changing names from Western ones back into the original Japanese, for example) and also adds new characters.
Like Professor Layton.
Being an unofficial update it's neither endorsed by developers Level 5 or particularly easy to install, but if you're comfortable dropping your legally-purchased version onto a PC, you can grab it from the link below.
Inazuma Eleven 2: Blizzard - Remastered Version [GBATemp, via Tiny Cartridge]