It happens all the time. Stadiums aren't cheap to build so why wouldn't you maximise their usage?What other professional competition in the world has most of its teams sharing stadiums like that?
- SoFi Stadium (Los Angeles): Los Angeles Rams (NFL) and Los Angeles Chargers (NFL).
- MetLife Stadium (New York/NJ): New York Giants (NFL) and New York Jets (NFL).
- Mercedes-Benz Stadium (Atlanta): Atlanta Falcons (NFL) and Atlanta United FC (MLS).
- San Siro (Milan): AC Milan (Serie A) and Inter Milan (Serie A).
- Stadio Olimpico (Rome): AS Roma (Serie A) and SS Lazio (Serie A).

even in the nrl a couple teams share a stadium here or there.