This IS an excellent topic and I'm glad that everyone has discussed it maturely, calmly, and respectful to other opinions. Thanks for that!!

The bullfights I've attended have easily had more Spaniards than non-Spaniards in attendance. There are complete sections of people/Spaniards whom you see in the same seats for every corrida de toros. Other sections have a higher percentage of foreigners. Sometimes you do have more than half the arena empty, though.

Saludos, MadridMan