It is a question of the level of difficulty to exploit. That is what determines the cost to them. reCaptcha is 2x to 3x more expensive to solve than any other.

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if you are unfamiliar with the current prices in the market, but do not need to use outdated information. At the moment, there is almost no difference in price between SM and recaptcha. Today to solve 2 captcha SM is two times more expensive than 1 recaptcha. Well, if you use the software that solves for free and one and the other captcha - then there is no difference at all.