can't afford

My husband wants us to have an RV, but I keep telling him that we cannot afford it. He knows it, but still it never stops him from looking at the park model rv. I think he has a dream that one day we will be able to afford it and drive it all over the country. He has many good dreams for us which are good. Sometimes he looks online and sees all this used RV that he thinks we could afford if we wanted too but I always say we do not need it. I understand he likes to travel, but I rather spend my time at home.