Bill Goldberg strongly considered joining TNA a few weeks ago. There were several idea's being discussed, one being that he would've joined Sting's team for the match at Lockdown.
Goldberg's main motivation to join TNA was to "stick it to Vince." However, Goldberg didn't want "lower his value" by coming in for anything less than what he believed is fair money compensation for his name value.
Unfortunately, Goldberg doesn't realize that the economics of wrestling have changed greatly since his time in WCW.