Means if you have a scar revision, the results could be worse or better. Personally I don't like the odds. Only time I have seen it make an improvement is on those who have extremely bad scars....very wide. In that case, your likely to see improvement. Sounds like your isn't that bad. I'd just do FUE. In the long run, you'll be happier. nice thing about it is you can do a small session and see how the growth is....say 100 or so. Just research and choose a dr who is going to give you results. someone who is confident in his outcome.
Yes Dr Feller, Dr Cole and Dr Lindsey are from the US. It depends on the nr of grafts. I would guess between 10-15 USD per graft when you have to get them in a scar, but not sure could be cheaper - I paid 7 USD per graft approx for FUE but that was in virgin scalp. Guess you would minimum need 500 graft, but I have not seen any pictures, and I am not an expert on scar repair. Keep researching and keep looking and asking. Good luck. Cheers