The problem isn't the number of exchanges really. It's that's the main exchange for this coin is Craptopia. What's the use when you buy a bunch of Sumokoin and you can't withdraw it it to your own wallet because Craptopia's withdrawal system is broken and they have no idea when the problem will be rectified?
Do Sumo a favor and ditch this poor excuse of an exchange on the first chance you get. The sooner, the better.
In recent sumo dip I bought it on Cryptopia and withdrew to my wallet three times. All three times no problem. Arrived in ~20-30 min.
Either you were lucky, or I got the short straw. My withrdawal has been stuck at "Processing" on that crappy exchange for the 5th day now through no fault of my own. And according to them support tickets have a waiting time of 20 days before they're even looked at. So yeah, I'd welcome a more reliable exchange in their place.