Yes, great riqq teachers are very rare, but there are just enough that a serious student can find one, if the dedication (and sometimes, the money for train or plane tickets), is there.
A wonderful Syrian percussionist and renown riqq player, Faisal is a very knowledgeable and supportive instructor, who is known for his mastery of the classical Arabic repetoire for riqq. He lives in the San Francisco area and performs and teaches nationaly. Faisal is also an instructor of darbekki at the Mendicino Middle Eastern Music and Dance Camp every summer. http://www.middleeastcamp.com/Middleeastcamp/Mendocino.html
One of the most amazing young drummers out there. He was a student of Souhail Kaspar and a member of the UCSB Middle Eastern Ensemble throughout his teens, and his prodigious talents even then were extraordinary. He is a wonderful riqq player, and as many others here, is also an amazing performer on other instruments of Arabic percussion - and cahon, too.
Most classes offered in Sebastopol, Santa Rosa (Sonoma) and Point Reyes (Marin), California. (Classes taught by Donation. No one turned away for lack of funds. Everyone is welcome to learn!)