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The risk there is investing in the wrong sets, whether directly or indirectly.
Back in the 90s when Fort Legoredo came out for Xmas, it was the talk of the (small) town. $85 usd RRP, but if you delayed you’d be looking at a easy 2x markup on the streets.
Today I see used sets advertised on eBay for £250, which isn’t bad. But that’s for the primo sets, not the innumerable smaller sets sold nowadays.
They seem to make a set for a short time, so if you have the money eventually it'll go up when they have sold out. Is it worth filling your spare room with lego, im not so sure.