My guess is it's simply a chargeback risk. It's the reason casinos and adult sites have trouble getting credit card processing and are charged much higher basic rates, even under the best of circumstances when the casino or adult site is operating entirely within the law in the jurisdictions it allows.
Punters run a lot of chargebacks on casinos, and people whose spouses catch a XXX video or game on their card statement will lie and run chargebacks too.
In the case of Valve, a lot of chargebacks would drastically increase the processing rates demanded by the payment providers for all transactions across the board, not just those related to adult games.
There's probably a great market opportunity here for a game store focused on adult games and willing to take on that risk.
Punters run a lot of chargebacks on casinos, and people whose spouses catch a XXX video or game on their card statement will lie and run chargebacks too.
In the case of Valve, a lot of chargebacks would drastically increase the processing rates demanded by the payment providers for all transactions across the board, not just those related to adult games.
There's probably a great market opportunity here for a game store focused on adult games and willing to take on that risk.