It might fetch as much as $15 per kg depending on the quality and what sets were in it. Just one rare train in there and you're going to look at substantial money.

Did buy 7.5kg of unsorted Legos very recently,so yes, there's some interest.

I would totally buy it if you're able to ship to Canada. Love collecting and building with LEGO.

No joke, my child loves Legos. We always grab 'em when they show up on freecycle or Facebook or where-ever.

Post to craigslist or facebook marketplace and you'll quickly find out how in demand they are. Esp if there are minifigs. Lego collecting is VERY popular right now.

How much is there and do you live in the USA? I'm interested, if you want to talk about it, PM me.

If you don't want them I can take them off your hands for you :)