Inside storage worth the money?

If the money is not an issue, then yes, in a heartbeat. Someone down the road will appreciate the care you took with it, and most likely, you will get more for resale value.

Edit... We paid twice that for just covered storage in Phoenix. Not for resale, but because we care about our vehicles, and didn't want to deal with the damage the sun causes. If you're going to do it, don't do it for resale value, but because you love your coach.