It is all about taste and what you can afford. If I have a 30k Rhino and a 30k rail, my Rhino is sick and killing everyone. I got a 30k rail, I am stuck in the middle of the pack and getting slapped around.
My Rhino is not going to be playing with Rails, it will be playing with other Rhinos. You bring a rail into play, go big and fast all you want, but I will turn sharper, fly further, not cost as much getting there, better gas milage, and overall have a good time without all the stress the comes with rail owner.