On the other hand: He should be reluctant to elaborate on the exploit since he's part of a competing business and that favors him, but that fact also makes you wonder why he still isn't playing. Reducing the max bet doesn't change strategy or eliminate the exploit ... it just causes it to take more time to bleed the house dry. Regardless if your mad the rules were changed, most people would still be playing if they could basically print money.
I think the reason he's stopped playing is because his luck ran out and he has realised he had nothing more than luck on his side.
All this FUD about the site being unfair is just that - FUD. His goal is clearly to discredit Just-Dice with a view to gaining traffic at his own pyramid scheme dice site.
If he has a strategy that works when the max bet is 300 BTC then it will also work when the max bet is 75 BTC. You just bet a quarter as much on every bet. Nothing else changed. But he doesn't have a working strategy, he has superstition, too many coins, and a disregard for their worth.
So he says he has an exploit that is different than the previous two he told me were "the exploit". So is he lying this time, or was he lying the previous two times? (That's not an exclusive 'or').