Being CASC registered, South North will only be able to pay a maximum of 10k per year for players. In the 2018 season, I reckon South North would be in the bottom half of a 'money paid to cricketers' table.
It definitely isn't "getting like premier league football". There's a reason why they can attract players and that's because they're well ran with great facilities. A FFP model wouldn't work either as South North, as you alluded to, are able to raise massive amounts of money year on year. Always tends to be a little bit of jealousy surrounding their success but ultimately it's up to everyone else to up their game both on and off the field.