So, the maze was in full swing, and I had started gathering maze coins for the limited time event. When the last few days came around, I had only about 3000. Since I wasn't able to check every 4 hours, it was not enough to complete the limited time path. With 10 hours left, I had three spaces to go. I woke up at 1 to collect more maze coins, and was able to move a space. I then woke up at five to collect more and to see how far I was. I couldn't make it. Since I had already invested so much into getting the monster, I decided to pay for the remaining coins needed. Ten minutes remained on the path, and when I hit purchase on the maze coins, the purchasing sign conveniently spun around and did nothing. I hastily rebooted, and this time it worked. But SP wouldn't go down without a fight. I had to put in 3 passwords, verify my account twice, and when the purchase finally went through, guess what?
THE LIMITED PATH WAS GONE
I've never seen SP not want money.
Trying to get a refund now.

Sounds like you ought to start looking ahead to see what the costs of paths would be before you invest. Check the link in my signature for the wiki.