Sorry, but when you pay for a product you expect it to work, no messing around it should work.
I've been using WP for years, I understand how plugins work, and I know when code is full of bugs.
Yes their free shopping cart is fine but the upgrades are useless, they are selling beta software. No two ways about it.
The forums? Have you read what people are posting over there? No support, no replies to emails, many requesting refunds. I suggest you go read the forum.
Buy a ticket? You're telling me to spend 80 bucks to get something fixed which I have already paid for? Yeah sure, I must have 'TOOL' writen on my forehead.
OK, you go buy something from your store, take it home and find out it's broken. You go back and try to get one that works or ask them to fix it but they ignore you, so you're stuck with a product that doesn't work.. I'd call that a con.
What's different here is the developers know full well their code doesn't work (again just look at their forums) but are selling it so people like you will pay out 80 bucks to get it fixed.
That is a con.