The numbers and relations you claim are way off, which is particularly egregious given that so much of this data is readily available in press releases from Nissan and Tesla.
While Nissan sold a 100 MILLION.
In what time period, or should I say era? According to Nissan's own press report, the Renault-Nissan-Mitsubishi alliance combined sold 10.6 million units in 2017, with Nissan's portion being 5.8 million. Your claim is off by almost a factor of 20! To put how outrageous your claim is in context, the total number of cars produced worldwide, over all companies and excluding commercial vehicles, appears to only be about 73 million! Even including commercial vehicles still falls short of 100 million.
They've sold more Nissan Leafs than Tesla has sold total cars, and the Leaf is just a footnote for Nissan.
In another press release, also from January 2018, Nissan states that they sold their 300,000th Leaf vehicle. Meanwhile, in February 2018, it has been reported that Tesla delivered their 300,000th vehicle. So your claim that Nissan has sold more Leafs than Tesla has sold total cars is certainly debatable. With currently available data from searching the web, it looks like Nissan and Tesla were roughly at parity in Feb. 2018 in terms of electric vehicles sold.
In any recent period, if Tesla sold X thousand, Nissan sold X million.
That is a bit of disingenuous comparison. Of course Nissan sells more cars than Tesla currently does since Nissan is a much older and larger company and it manufactures more types of vehicles and at many different price levels. Meanwhile, Tesla is a much younger company that so far has mostly catered to the luxury market (though it is starting to push the prices down with its newer Model 3). Nevertheless, your relational claim of "if Tesla sold X thousand, Nissan sold X million" is way off, again by almost a factor of 20! Per the figure I cited above, Nissan sold 5.8 million vehicles in 2017 while Tesla delivered 101,312 Model S and Model X vehicles in 2017 (note that Tesla also sold a handful of Model 3s in 2017 not included in the 101,312 figure). The correct relation, which is only good for 2017, is that Nissan sold about 57 times as many vehicles as Tesla did, not 1000 times as you claimed. But who cares about comparing total vehicles sold over all types!
The appropriate comparison here is the number of electric passenger cars sold and with that we see a much different perspective. Per the above figures, Tesla and Nissan appear to be at near parity over Tesla's entire production history. But since you said "in any recent period", let's look at more recent, shorter term, data. According to Tesla's press release, they delivered 29,997 Teslas in Q1 2018. By contrast, in the same time period (January through March 2018), Nissan sold 23,989 Leafs. Note that Nissan reports its sales by month, per region, so one has to add up the Leaf sale figures for Japan, Europe, and the US across the January through March 2018 production and sales PDFs, all found here.
Point is, in the most recent quarter, Tesla outsold the Nissan Leaf by 20%, a substantial margin.
Full disclosure, I didn't bother including Nissan's other electric vehicles, i.e. the e-NV200 van, since only a total of 456 of them were sold worldwide in Jan-Mar 2018.
Nissan isn't one of the top most valuable car companies. Why is Tesla?
Oh btw Nissan (and BMW and Chrysler and all the others) make money when they sell cars.
I'm not sure what point you are trying to make here but it doesn't matter. I just wanted the set the facts to be set straight, with citation.