[bluGill]

> Caches are a good thing that can significantly reduce your hosting costs.

Sometimes. Sometimes they are a bad thing because your hosting costs are nil and the customers gets more benefit than expected from the one call without paying for it.

Years ago there was a company that decided to save on costs by buying just one subscription to some trade magazine and share it between the 7 people who needed it. Problem was the magazine was very niche and so the lost of 6 subscribers was 10% of the total subscriber base and the magazine couldn't afford to run at all anymore.

If your result can be cached and reused then you need to figure out if that caching fits into your plan.