>>What does Trump Marina gain if the chip they sold yesterday at $25, brings $200 the next day on Ebay? Is all the negative publicity worth it to the casino?

Its the same strategy which TY used to very successfully market beanie babies. They deliberately shorted the market of certain issues to create a huge secondary market values this helped them sell more beanie babies overall as greedy collectors grabbed them all up hoping that they would have the next rare bb.