1. Yes, you could make $100k profit a year. 2. It would require roughly $750k-1M in capital, accounting for your product & overhead (space & payroll required, as others have said). 3. If you have that kind of capital, there dozens of far better investments. LEGO is high-risk. There's easily a half-dozen strategic risks to the business model, and not nearly enough strategic advantages to mitigate them. 4. Therefore, treat LEGO "investing" like you do betting at the horsetrack. Enjoy the scouting and picking of winners/losers, strategy of placing your bets, thrill of the race, joy of victory - if you take pleasure in that, it can be the most profitable hobby you'll ever have, but don't fall prey to illusions you could make a living at it. Yes, there's always stories of someone who "wins big at the track". Or some old timer who lives there in the smoking lounge and actually does make a living on it. But that simply isn't the norm.