Something to keep in mind... and, please, this isn't meant to be red vs green. But you will get less straw from the rotary. The rotor turns a lot mor material to dust and fines that won't pick up with the windrow. This can be good, it keeps more of the fertility in the field. Keep in mind straw contains quite a bit of P and K.
But here's the deal. I mentioned my neighbor and how I buy some bales of rotary straw from him, as well as he does some custom baling for me (combined with walker). More often than not, yield is 3x to 4x the number of little bales per acre from the walker. Same guy baling, similar wheat, different combine. There may be a little more straw in the rotary bales by weight, but they are very similar. He loves his rotary, but is always amazed at the pile that comes out of the walker.
It is very concievable that if you are selling by the bale, the extra bales will more than pay for having someone harvest for you. No kidding- you will most likely have extra money left over... or in my neighborhood with straw going for $2-$3 a bale before the drought you would.
Good luck- I'm gonna put on my welding jacket now so I can stand the heat...