We can buy some altcoins new coming on Cryptopia. The "little" new coming alt coin can't be listed on some "big" exchangers.
On the other hand, be careful for some "little" exchanger, they may run away with you money anytime.
I'm no linguist, but it definitely sounds like you believe that "running away" with your money isn't in the cards for one of the larger exchanges, but let me be the guy that repeats himself; the biggest losses, hacks, scams have come from the place that everyone least expects. It is actually quite often that these big exchanges have security breaches, attacks, hacks, or just exit-scam themselves. When there is that much money and bitcoin circulating into one place it's a concentration point for hackers and anyone who figures out a small-exploit that wishes to scale it up.
I've said my piece for the most part, but I would like to say that big exchanges have disappeared in front of my eyes many times, leaving people in awe and class-action lawsuits that go no where. I've dealt with a few smaller exchanges, and watched plenty of them operate and I'll say that I definitely think that small exchanges are less likely and have less incentive to disappear with your money.
The smaller mom and pop shop is more likely to care about it's customers, where as bigger corporation just see numbers and at a certain point all they care about it what is going to be a bigger number at thee end of the day, sometimes closing up shop and running is their biggest number after they've dehumanized their client base.