Is it ever worth it to LAG it up early

[Dima2000123]

I don't play in high buy-in SnG's, $20 is the highest I go, but I'm wondering whether going very conservative early and very aggressive late is the only way to play SnG's.

When I play non-turbo SnG's, I often play speculative garbage in late position, looking to either hit a lucky flop or push someone out of the pot with air. Sometimes I get short-stacked or even bust very early, but more times than not I get enough cushion to lose a coin flip later on without getting crippled, or maybe even amass a stack big enough to bully others.

Is there a merit to this strategy (when played correctly, obviously)? Or is it a money loser in the long term? Assume that the player doesn't multi-table, if that makes a difference.