The big risk with just about any treatment for pain (whether it's back pain, migraines, plantar fasciitis, and everything in between) is that most of them have placebo effects upwards of 40%. For example, the following randomized trial:

http://www.ncbi.nlm.nih.gov/pubmed/21602565 (links to abstract)
http://www.ncbi.nlm.nih.gov/pubmed/20068208

found that PRP made no difference compared with placebo either during the trial or at one-year follow-up, and 60% of participants in both groups were happy with their results.

I would guess that $1500 isn't much less than a consult with a dedicated sports medicine specialist, even in the U.S. It might be a wiser investment