If you’re selling by the kilogram, sorted bricks are worth way more. A kilo of only Technic pins and gears might fetch $80. A kilo of random baseplates and loose tires? Closer to $15.
Here’s a dirty secret: mini-figures are the real currency. A handful of them – just the little guys, no legs – can be worth $200 per kilogram. That’s not plastic. That’s petty cash.
Lego Price By Weight at Kaitlyn Guest blog
The “Bricklink” Economy
Now, if you’re thinking, “I’ll just weigh my bin and sell it,” slow down. The real money comes from parting out sets. Dedicated sellers on sites like Bricklink buy bulk lots, sort every single brick, and sell them individually.
For example, a single transparent red 1x1 plate might sell for $0.50. There are about 1,000 of those in a kilo. Do the math: that’s $500 per kilo. But you’d need the patience of a saint (and very good eyesight).
