Precise tuning is nothing our vendors can really do amidst the sound of honking horns and such in the open air shops and markets of India, but we can do it very well in our quiet shop here in North America. Re-tuning an entire instrument to A440 requires the scraping of every single reed, going back through after it settles, etc. It takes time to get it stable, and that's why a fee is added for this service. If you plan to play with other concert tuned instruments, the service fee is a great investment. If not, the extra service is not necessary.