I left the sport after Dodge left but was reintroduced by SlapShoes excellent YouTube Videos on the history on the sport. That got me hooked on Dale Jr's podcast and the interesting people like Evernham being interviewed (which brings me back to Dodge). Since then I'm tacitly paying attention, seeing how Brad K is doing.
Hendrick is interesting to me. The 5 is basically self funded by Hendrick because of Larson's behavior last season. The 48 is sponsored by Ally which used to be known as GMAC which has a long standing relationship with Hendrick (So effectively the GM factory team). I don't know how much money Liberty University is paying to be on the 24, but apparently Byron was the one who pulled that in. So that leaves Dupont (Axalta), and all the Chase Elliot Sponsors (Hooters, Napa, etc). Hendrick is a marketing monster in the sport and IMO it seems like they're hobbling together sponsorship. Penske is a mess with sponsorship and I don't know how Roush and Childress are pulling it off. I can hardly recognize any of the cars. It'll be interesting when the Nextgen cars come out.