Jake was continuing this sponsorship deal just to help Clara and Tiffany's company as they helped him a few years ago, most of all for the friendship they had.
Right now Jake had to be very careful not to disclose his contract with Tiffany and Clara's company, otherwise, John and Alan's companies wouldn't want to know that they were paying 5 times what Tiffany and Clara's companies were paying.
When Jake left college and joined the NBA that would be even truer, after all any Jake contract he got from the NBA would be at least $ 4 million a year, so he couldn't keep getting so little from Tiffany and Clara's companies.
In fact, it would come to a situation where it would be better for Jake to give them both money than to continue with the sponsorship deal, Tiffany and Clara knew very well what Jake was in and understood very well and were grateful to him.