Templates are overkill. They don't have good copywriting - lorem ipsum all over. And this is just start. Soon there will be animated websites section, aggregation of free tools and localstorage based tools.

All that matters is that they convert. There's no way to know they will convert outside of testing in an actual campaign. And you generally want to have a load of landing pages, multiple variations for each segment which you do A/B testing on. Buying a $20 template and sending all campaign traffic to a single landing page built on that template is costing you a LOT more than the price of the template.