How does that work in terms of money available? Does promotion to the top 14 come with a bonus to sign more players? Or do the owners now just decide to dip into their pockets so they can have a decent crack at that level of competition.
Very interesting situation which I'll answer with a lot of extra info:
The LNR ( a separate body from the French Rugby Union who run the Pro D2 and Top 14) signed an obscene deal with Canal+ and said that 2/3 of it goes to the Top 14 and 1/3 goes to the Pro D2. So the money in Pro D2 is still pretty good and probably better than Super Rugby. But yes, Biarritz will get more funding from their promotion.
Then also, Biarritz were threatening to move their club from Biarritz to Lille (which is literally the polar opposite of Biarritz) because the local government wasn't supporting the club. Now the local government have egg on their face because Biarritz have been promoted in very dramatic fashion and will have to now shell out much more for the rugby team. So again more money. Their promotion was intense because they relegated Bayonne, who are their neighbours in the basque region. Like, it's essentially the same town and are separated by about 3km yet they despise each other. Their relegation battle was tied 6-6 30 minutes into Extra Time so it was decided on a penalty shoot out with Steffon Armitage kicking over the deciding penalty. Intense stuff.
But yeah, long story short: they get more money but also their investors will have to stump up more.