Legos are bricks that are for building small sets that the company designs, and sometimes with the consent of other brands. The bricks don't have to just be used in sets. Most kids will pull them apart and use the parts they like. (This is what I did). Although the box recommends about ages 4-10 years, a recommendation isn't always the best choice to go for. They can be ordered specifically from the company for usage in building projects. Also, many of the Lego mini figures can be customized and used in stop motion videos, displays, or even scaled down replicas of cities and buildings. Although a kid may not be able to build more than a little block with wheels, this only applies to them, and others with better abilities can build much more realistic portrayals. They can also have business abilities, such as having entire video games based of of the franchise. Many Lego games would intrigue the older side of the age limit (around 9-11 years of age). This proves they are not just meant for young grade schoolers. I am interested to see your argument next this round.
I don't think you understood what I was talking about in the second part of the argument. People can use them in very creative ways to help a business, build a model, or even make videos. Besides, if someone wanted to build an Empire State Building replica, than it would be better to order bricks directly from the company, and this in't marketed towards children. They also have been used in learning programs for schools. They have more potential than a kids toy.
The stop motion videos are usually not very good and made by older children (there are exceptions, of course). Businesses and architects generally use a 3D program, which is more precise. Lego do not follow a very coherent scale and are not detailed enough to actually build something complicated (for example, for house, you can't build the foundations under it... A house made just from a lego blueprint would collapse).
The way I described them as being used for businesses, is how you sometimes see diagrams or tiny structures in store walls. And have you ever been to Lego land before? They have TONS of theses structures, life size, and scaled down all over the park. What some people would do is they will make dioramas with the green base plates, and they can pose the minifigures on the dioramas and make them hold and do all kinds of things. The fact that they are marketed towards children won't stop older people from buying or using them for several things. Sure someone can say Nerf blaster toys are for little kids, but many older people use them in organized "Nerf wars" on college campuses. These people beef up and paint them so they look and function better. They even buy specially made gear for the activity. WHY can't the other above reasons for Legos work for you if it works somewhat for Nerf toys. Try rebutting that! Vote for con.