Hello there. I had the same problem as you, then i started to get a few crowns and then Protection 48hours was available.
Want to earn 60+ crowns just by doing quests a hour?
Watch my stream - http://www.twitch.tv/dtacgaming
I bough protection 48hours (2 days) for 10crowns each (was on sale) they are 20 each but you can make that 20 crowns back within a quests.
I hope this helps because i have had the same problem as you. Let me know if you need anything man.