Because I'm not sure I do.

Obviously it depends on your definition of the word - my interpretation of 'indie' would more or less be bands from this list:
http://pigeonsandplanes.com/2013/03/the-50-most-influential-indie-rock-bands/

I don't take this list as gospel, but I'd say I only like 10 or 12 out of those 50 bands, some which aren't very indie at all and shouldn't even be on that list.