We all know F1, Indycar, Nascar, V8 Supercars and DTM draw big crowds but when you watch several other racing series during the weekends there's always 1 question that comes to mind:
How do they survive (financially)?
I'm talking about:
F3/F4 series
WTCC
TCR series
(International/National) GT series
etc.
I mean, EMPTY stands or at best a handful of spectators.
And another question: how do the venues they visit get their income? They still have to put logistics/organization/marshals in place for those weekends.
This is not meant to be a complete list, but here it goes:
TRACKS
Hosting Fees that may be reasonably cheap or dirty expensive. Equipment rented at the track and services offered are also charged. The race promoter will pay for this fees using the registration fee that every competitor pays, plus money from event sponsors and to a lesser degree money from eventual the public. Some series go to the extent of being 100% private with no public allowed at the track.
Only series like F1 have the privilege of charging, not the circuit but the local race promoter, for their races to be held at the place.
The track owners involvement comes into play because changes are usually required at the track and the event must have enough return for them in order to pay for these changes.
The racing promoter will also rely on the track owners as partners of the event if the race somehow brings some return for them (the case of public owned tracks).
CHAMPIONSHIPS
As said before, money comes from competitors, sponsors, TV rights (when present) and the public present at the tracks.
Some racing series also receive money from automobile clubs and federations as a matter of self-promotion.
Another thing not uncommon is that some series may receive incentives or tax reduction from the government, usually related to a high-performance sports or technology committees.
There are also one-make racing series where a single team is responsible for all cars or bikes, those are drawn before the races. Drivers will pay for racing without having to worry about infrastructure or logistics.
RACING TEAMS
Sponsorship from third parties, money from other company's branches (when it's the case), drivers, maybe tv rights and prize money.
Smaller championships will distribute little to none tv rights or prize money.
Some teams are heavily funded by rich enthusiasts that will operate at loss if necessary, but always trying to at least break even.
Other teams will balance their income and costs to reach profit at the expense of sponsorship, pay drivers and other sources.
And some teams will operate as a service, where you pay for their expertise at the track, also they could even rent their cars or bikes.
FEDERATIONS
Membership fees, event support fees, homologation fees, other services and sponsorship arrangements for the "development of the sport".