The price is written on the website $1,350/year for the standard subscription. That said, you make good points. I think it's possible to make it work for them

The price is written on the website $1,350/year for the standard subscription. That said, you make good points. I think it's possible to make it work for them but for this they'll need to have explicit guidelines they apply internally to avoid conflicts of interests when accepting patches for example. I hope however that the increased amount of revenue they will get will help them finance more development work for both the open core and the pro feature