Been there, done that. It was a very hard decision for me but I decided to go for it to see if I could have a better quality of life. The cost was intimidating to me too. The staff in my dr's office told me about Healthwell Foundation. I called them and they agreed over the phone to pick up my co-pay. They told me then if I could afford to go ahead and start it they would reimburse me. They were absolutely wonderful people.
I did start it. I had some problems with the first infusion and had to have some extra steroids but got through it. The 2nd was easier and then it got very easy. I guess my body had to decide to accept it.

I took it for a year but I did not get any help from it and in fact got rather ill.
I would certainly try it again. I have done several things to keep going including a rather big spine surgery almost a year ago. I am scheduled for another CT Myleogram next week and possibly another surgery.
I think it is all a very personal decision and you have to weigh the pros and cons for yourself. I know I would not be happy if I didn't do everything I can to live the kind of life I hope to live.
Best wishes as you make this decision.