Absolutely! Especially gold, that's 5-10k per unit of gold! Very valuable for someone in a sidey.
Don't read too much into the whole fines and stuff with illegal goods. In my experience if you get scanned and don't reach the inside of a station in time you get a fine of about 50% of your illegal good's worth so it's still profitable and fines don't go on your bounty which means you won't get shot for a fine. Attacking another ship that's not wanted will get you a bounty which means you're free game. If you're fast enough, get in and dock you'll get scanned but it won't complete which means you won't get fined. I've only ever been fined for illegal goods if I take my sweet time hanging around the entrance. Also, if you're friendly or allied with the local system they generally tend not to scan you or take a lot longer to do so.
So, yeah... pick up those cannisters there's not much of a penalty for smuggling illegal goods at the moment.
Be very careful of dropping into signal sources where you see only gold canisters lying around, its normally a trap (3 bigger ships will suddenly come at you guns blazing!)