lostclimate: I was talking about pirated games. I really doubt that someone buys a game after he tested it over a period of 30 days
Then he/she already won the game and played it to the end.

But regarding more expensive tools: The publisher can offer you a test version of that software. If this is not enough then you don't have to buy it. You can tell it the publisher instead of stealing. Often they help you then. Lightwave offers you an unlimited test version in terms of time. But you cannot save.

There must be some restriction to offer an incentive to buy.