Well, speaking other languages is certainly not going to get you a millionaire per se but it is undoubtedly going to make you more hirable (which given the current climate is good enough by itself).
Doing SEO in English is tough because you have a huge competition. The SEO companies in the US have evolved so much in comparison with European, Asian agencies that trying to compete in the same market is tough as hell. As a result, optimising for other languages proves to be easier if you know what you are doing, in order to have that knowledge you need both good SEO skills and a very thorough knowledge of the language/market you are trying to target. Additionally, if you diversify your portfolio and are able to target multiple markets you would be less exposed to the health of one specific markets and will have more opportunities to generate revenue from different sources.
In a more complex way, optimising for search engines other than Google seems to be arcane for most SEO agencies in the world unless they are local. Markets like Russia adn China end up being great opportunities because they have been less exposed to the financial turmoil and on the other hand the competition is minimal for the linguistic/algorithmich knowledge barriers.
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