I think a big reason is the chicken-and-egg problem. GPUs gained large spread adoption because of their use for gaming. It's only relatively recently that they'

I think a big reason is the chicken-and-egg problem. GPUs gained large spread adoption because of their use for gaming. It's only relatively recently that they've been exploited for more general compute purposes. There hasn't really been a "killer app" for FPGAs that warrants many people to have one.