The only times I allow it myself are in this case (zero legal availability) and for unofficial/fan translations of games not available in your home region/language. Nobody would be getting your money anyway, no theft of compensation/profits there. If any games do become available, though, then we should support them. The more we put our money where our mouth is for a return to market for these games, the more incentive there is for companies to bring more of them back.
The only times I allow it myself are in this case (zero legal availability) and for unofficial/fan translations of games not available in your home region/language. Nobody would be getting your money anyway, no theft of compensation/profits there. If any games do become available, though, then we should support them. The more we put our money where our mouth is for a return to market for these games, the more incentive there is for companies to bring more of them back.