A RAMDisk-backed page file removes useful RAM from the system. It's a net-negative. You're using RAM that would otherwise go towards useful things, like programs or file cache.
Again, if page file usage is a problem, you need more RAM, not less of it and certainly not allocating it to a RAMDisk.
Again, if page file usage is a problem, you need more RAM, not less of it and certainly not allocating it to a RAMDisk.