Well, that would seem to be correct at first glance. However, a surprising amount of large corporations pursue the kosher certification (at least in the US). I would assume that either (a) the certification organizations purposely keep the certification costs remarkably cheap in order to incentivize companies to get their products certified, or (b) there are enough indirect benefits to kosher certification to justify the costs (many people are under the impression that kosher products are more healthy, for example, and try to buy kosher items whenever possible). Or a combination of the two.
If kosher certification was a waste of money, it would be far less common.
And in addition to the practical benefits of certification, I know there are plenty of Jewish folks like myself who would be overjoyed if Soylent was made kosher. (I say this as a fan of Soylent since the early versions.)