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Charizard ex (Scarlet & Violet Black Star Promos) is one to leave raw for the moment. Raw copies trade around $19.53 while PSA 10s sell for about $26.00, a -76% Return on Grading. Grading and shipping fees would eat whatever margin is there.
Among the 25 cards in Scarlet & Violet Black Star Promos with PSA 10 sale data, Charizard ex ranks 22nd for Return on Grading and 20th by PSA 10 price. Of the 25 Promo cards with PSA 10 sales, it is 22nd for Return on Grading. The median PSA 10 in this set sells for $60.00. 5 of the 25 clear a 100% Return on Grading.