When does it make sense to buy normal crates?
According to the wiki, normal crates cost level x 400 coins. Depending on your level this could easily be in the thousands to ten thousands range.
On the other hand, you can get crates as cargo, occupying a space of 1. Compared to an equivalent piece of cargo, the opportunity cost is in the 10-100 coin range. That's a bargain compared to buying crates.
So perhaps when you have a glut of coins it makes sense, but in my experience I've always found ways to spend coins - new railroads, tracks, or special crates - so when does it ever make sense to purchase regular crates?
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