When producing an album, single, or your latest autobiography perhaps, remember that in the long run the cost of storage far outweighs the cost of producing more.
It's not just a financial thing. It's also better for the ego. There's few better feelings than selling out (in the product sense).
Next time you book a gig, whilst you consider the pros of that huge stage, the lighting rig and dressing rooms, think about looking out and seeing large spaces in front of the stage. Stage diving becomes dangerous too.
It's not just about being realistic in the short term, it's about laying the foundations for future. Fans like to have 'been there', got the t-shirt before everyone else.
So, focus on selling out.