Noble and others, thank you for the responses. I am leaning towards leaving them on. Since this is a hobby I feel that a yearly, or bi-yearly tube purchase is not unreasonable. After all I would probably be itching to roll something else anyway. My only other concern is the fire danger, but since this issue is about 50/50 there must not be a lot of instances of houses burning down. The tubes I use, 5814A aren't as costly as Mullard CV4003 that I was previously using, so leaving them on is what I have decided to do. Thanks again.
