Yes i had numerous times i just stopped for a few months and simply let the sub continue to run. Really dont care its 15 euros max a month and if you pay for 6 months at a time its even cheaper. I simply want to login at any moment without reactivating etc. Its the cheapest form of entertainment and its for me more then worth the 15 euros i spend each month on it.
87 months .. over 490 days play time over all characters = 5.7 days i spend from a full month on average in wow.
So arround 50k seconds a month meaning i pay 0.0003 cents per second i actually play. If you know something cheaper be my guest.
On the other side (if i would pay per month) I would now have payed a minimum of 1545 euros for wow.