Is it worth collecting limited edition Lego sets?

If you're looking at it as an investment, then yeah, rare Lego sets do go up in value, especially the ones that have been discontinued. But it's a long-term thing - you won't get your money back quickly, and finding a buyer for a specific set isn't always easy. As a hobby, collecting is cool if you actually like the sets themselves; for investment purposes, you'd be better off picking genuinely rare and sought-after versions rather than just grabbing everything.