Renting out "all season" is not realistic in my view, although I would say I am quite impressed by the 15% increase in capital value over three years - you should hear some of the figures I've heard quoted when I am on a viewing and overhear other conversations
I'll take the opportunity to voice my other point about this AGAIN - the people who tend to make impressive claims about increased future values are often the same people who aren't interested in selling resale properties at all. Capital growth is nothing if nobody wants to sell it once it becomes second hand!
The "I'll sell it to you but I won't sell it for you" stance, if adopted by too many, will do more to kill this market than any other factor.