If your client knows what they want.. just stock those strings for them.
how easy is that?
What you say is fine, if you have enough clients to make things work.. but 200 Racquets this years is not very much. Most of your client.. well about 80percent is players that are league players, club players in the 40, 50 60 year ole's who don't follow TW forums or really give a damn about new strings, or even new racquets. On the plus side, they all want a string that will make them better.