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Right. Casinos "still" offer 6-5 blackjack, because there's a major benefit to doing so.
We doubt that they even bother trying to quantify how much business is lost by dealing 6-5 compared to 3-2. Why should they, when all their 6-5 blackjack tables are full and, in fact, they don't want people who know the difference to play? They don't have to worry about card counters sitting down at a 6-5 table; it's an almost foolproof countermeasure.
Meanwhile, here's the math.
Let’s assume an average blackjack table, rules-wise: double on any two cards, double after split, no re-splitting aces, and late surrender. When natural blackjacks pay 3-2, the house edge is 0.55%, or a little more than a half-percentage point. Not bad. Changing only the payoff for blackjacks to 6-5, the house edge climbs to 1.9%, 3.5 times worse than 3-2.
No one won’t recognize that paying nearly four times more for the same product is way more expensive than it should be. Which would you rather pay for your Advisor membership, $50 or $175? No brainer, of course. But that's the choice players make when they sit down at a 6-5 table. We can only imagine all the money people have thrown away on 6-5 blackjack tables, when they could’ve simply gone to the casino next door or up the street to pay 3.5 times less.
So yes, there's a very good reason that casinos still offer 6-5 blackjack: This one little difference in the payout for natural blackjacks is extremely lucrative for them.