Samsara

You are right, the fanbase of Yankees is large but may not be that loyal.

Why they have a large base is the question ? The answer is because of the wins !! But if they don't make two consequitive playoffs (hypothetically), they will start booing their players too.

Why classical teams like Lakers, Celtics and Bulls have (hard core) fan base (unlike bandwagon like me) ? because of their wins and records.

Let TB DevilRays win three MLB titles -their fanbase will be large too.