I think at this point there is little chance the bubble will burst until the games stop selling and the buyers stop buying. Every BM66 SLE has easily been spoken for, even with the increased allocation; and it's seems like Stern could still sell double the amount of these offered. The LEs will all sell out easily and there is likely plenty of demand for the premium.
JJP is just simply following the same pricing principle- it will be interesting to see if the market will continue to support these prices. In Canada, the cost to buy a Stern premium or a JJP DI is going to start at near $11k and run in excess of $20k for a BM66 SLE or a top shelf DI. Wow- this reminds me of the days of buying collector grade MMs/AFMs, etc before the remakes began...