Doesn't seem consistent : me and my flymates were getting losses or usual profits at ethgreze and lave at the same time. They are probably nerfing it (or will) but at the moment, it looks pretty messy to say the least. The whole rare goodies implementation was a mess anyway (even if I like the idea and I know they'll make it work eventually).
UPDATE: Just tried (for the fourth time) and the price had rocketed back up to give 16k+ per ton profit. Seen someone else mention this happening to them too. Maybe a glitch, stick with it the price should come back up.
Made about 11k selling Lavian brandy not long ago.
There is something off with trade though. I've seen regular trade routes where the importer is actually buying the goods for less than the exporter, so you actually make the profit going the opposite way :/
Made 15k+ profits this evening but it seems that stations that sell rare goods will only offer low prices for rarities you have shipped from elsewhere. Jump to any nearby system and you hit the jackpot. I found that repair costs in my Asp are significant though - 330k after a 180ly journey! Have to stop bumping into things. It is still worth it but will take a little more time and will force you to explore neighbouring systems too.