There are so many software products on the market that it is nearly impossible to buy one specific program on the first purchase and find that is what you want. A lot of the problem is the advertising for software promises features and ease of use that rarely proves to be true. I hardly ever buy software unless I can use it for a trial period first to make sure it is what I need/want and it works as advertised.
Also, I think companies like Autodesk doesn't mind having their programs pirated to some extent. Piracy has probably helped them to dominate many industries that use CAD software. It makes more people familiar with Autodesk products and businesses benefit if their employees mess around with them at home or do work at home in addition to the office.