Because you can't pay everyone enough for them to not need the residuals before the content is released and makes money. You already see this trade off with actors getting paid lump sums versus points off of whatever. If everyone chose a lump sum, most projects would never happen, so it's not an option.

For construction, the real estate development firm is fronting the money and then reaping all the rewards (and risk) after. For a baker, the product is consumable - it is eaten and must be made anew. There are plenty of industries where work is done once and then is a passive (or at least greatly reduced level of effort) stream of income, and where without that subsequent income, the initial burst is insufficient.