Wait until Matt Walsh discovers Rocksmith which is just guitar hero with a feal guitar input. It's just a different controller.

If you want to:

A) Play guitar music

and

B) Have no interest in forming or joining a band or making public appearances

then

C) Playing your guitar at home is not really any different from playing Guitar Hero at home.

Now I will say this...

Learning to play a real guitar may end up more fulfilling. You may learn music theory. It may open up avenues of interest you didn't know you had.

But that's all "may" and it's not necessary. Additionally playing a real guitar costs way more money than guitar hero.

Also most of these people make good money off of it.