It's a tough decision. They could serve to show off your growth as an artist (which could potentially help if somebody doubts that your tracks are really yours) but in the end you must do what 'you' feel is the best way to represent yourself.
Since you seem to struggle with the decision you could create playlists to sort your works into "represents me well", "s'alright", and "sins of my youth" or something and then carefully think about what you'll keep and what deserves... oblivion.
Either way, your current catalogue was good enough to get you scouted, so I'd recommend that you don't stress yourself about it 'too much'. ;)
BlueMonday1984
I say let them stick around - its always nice when you can see an artist's progress over the years.