@Laotionne - The short answer to your question is yes. Relative to other appliances and electrical devices in your house, hot tubs do cost a lot to operate. I have a friend whose electricity bill almost doubles during the months when he uses his hot tub regularly. Of course, he has a wife and three teenage children who also use the tub, so this makes for many more uses than a single person would have.
There are some hot tubs that are more energy efficient. However, these are generally more expensive, so you would need to decide which option would actually save you money. You might also want to consider a hot tub that uses wood to heat the water. This could be a way to save a bit.