He is probably happy with the current amount of supporters, and if someone new wants the game will have to open the wallet for it...and he is probably asking people to not leak the game because i think is very unlikely that NONE of his supporters uses F95zone.
And if for some reason his numbers go down, he probably thinks that he just need ask less money for it and people will make a line for the game, or he just need to release on steam.
And lets face it, most devs leak their games here (or dont mind being leaked) on the beginning to gain traction, but the moment they dont see a need to have the game here anymore for any reason (enough supporters, number not going up anymore, steam releases giving what they want and etc) they will do everything in their capacity to avoid the game being leaked here...and with steam there are devs who thinks they dont need their game on F95 forum.