To quote Emma's thoughts in Chapter 16: "There had been no real affection either in his language or manners. Sighs and fine words had been given in abundance; but she could hardly devise any set of expressions, or fancy any tone of voice, less allied with real love. She need not trouble herself to pity him. He only wanted to aggrandize and enrich himself; and if Miss Woodhouse of Hartfield, the heiress of thirty thousand pounds, were not quite so easily obtained as he had fancied, he would soon try for Miss Somebody else with twenty, or with ten."

Nevertheless, I can see this point. Mr. Elton likely will make a good husband because he will choose to love the woman who brings him fortune; perhaps as Charlotte was able to accomplish inP&P. I cannot blame Mr. Elton and find Emma's idea of class humorous.