Advertising is expensive. From the article: "filings show the super PAC immediately plugged the Musk money into an entity called Texas PAC, which took to the air with advertisements praising Paxton and attacking Democratic rival James Talarico.

“Musk’s donations armed Senate Republicans to take over the airwaves in Texas,” the Texas Tribune noted. “Using Texas PAC as the vessel to book airtime, SLF has thus far spent over $159 million on TV, radio, and digital advertising, double the outlay from Talarico’s campaign, according to media tracking firm AdImpact.”"