That's the thing though. With 'cheap' NBA franchises going for 3B and MLB median going for 2B, it probably breaks even in Montreal's case as the Peel Basin plans are open air. Might even be in an owner's favor if they can get events in a building they own.
Yeah, which seems weird because revenue differences between MLB and NBA clubs is like the same... but I think the NBA's value is higher because of the difference in national revenues vs local ones. Like, you're just guaranteed so much more revenue from the NBA league split compared to MLB that the value of a team is higher, because your floor is lower.
But for Montreal, I'd still say the total bill for baseball is going to be higher. Very few of the stadium deals are 100% public, and teams usually get the overruns, since it's extra stuff they're asking for. That's gonna offset a ton of the difference in expansion fee.
There's also the organizational startup costs. You're getting zero revenue for three years of organization building, hiring everyone from GM down to ushers and vendors. You need marketing people, and designers to do logos and brands, and uniforms and publicity to sell season tickets, and a ticket office to take those sales. With computer systems to integrate your business.
If the Moulson family bought an NBA franchise, it's just like "Open new tab" in their existing infrastructure. Arena seating chart is 95% done already. You know your colours (Habs bleu with rouge instead of rouge with blue) and your marketing team can get to work. It's a ton of "do this for a second team now, and we'll get you some help later." You're growing the existing organization by like 20%, not 0 to 100 like MLB.
MLB organizations are also just bigger than NBA organizations, because MLB teams have five minor league teams and 150 players to develop. NBA teams have like 25 guys on a max of two teams. Even though minor league teams can be independent, you still have coaches, managers, scouts etc at every level. NBA teams don't have spring training complexes, but MLB have to build one.