Why wouldn't you like rollercoasters??

Rollercoasters are one of the most thrilling experiences you can imagine. There are thousands of rollercoasters around the world, some fast, some scary, some down right heart-stopping. Not all of them are scary though, many of them are pleasant and enjoyable without being ridiculously ferocius. So my question is, why wouldn't you like rollercoasters? they are so AMAZING!!