Apart from the obvious explanation that this was just not considered in the story and wouldn't have fit there, there is evidence from the movie itself and its depiction of Nikola Tesla.
Tesla was afraid of the machine's power once he realized what he actually created there. Remember that when he gives it to Angier he also writes something similar to
The only advice for the machine's usage I can give to you is, destroy it!
So Tesla built that thing for him, but he also realized how much power this thing actually conveys and the potential danger this machine poses outweights Angier's possible use from it. I think he mentioned before that he thinks humanity might not be ready for all his ideas, and this machine is an instance of that.
One might ask then, why he still gave it to Angier instead of just destroying it right away or not finishing it at all. But I'd assume it is partly his pride in having achieved such a scientific breakthrough as well as his inclination to honor the contract and promise he gave Angier. In addition to that it might also support the common motif of the scientist who only realized the true danger of his invention after the fact and is reluctant to take full responsibility for it, just let Angier take the hard decision to destroy such an amazing technological achievement.
Last but not least, Tesla didn't seem too inclined in making money by dirty tricks instead of by genuine appreciation of his developments. He wasn't really the person who did all this to make a fast dollar, but for the progress of mankind and if he would take money, then because his products are well-received and appreciated, but not just by misusing them to produce "dirty" money. In this regard he might indeed be seen as a worse businessman compared to Edison, who didn't always play fair afterall. (And in turn this contrast between Tesla and Edison is also used in the movie to emphasize the rivaly between Borden and Angier.)