I just purchased an ASUS Dark Knight WiFi router.
Based on the link's benchmark results, it was able to successfully route ~800Mbps. I cannot tell from the performance review how many clients generated the bandwidth (it's not clear) but they claimed it maxed out their test bench by successfully handling 34,925 simultaneous connections.
Even though this router is more expensive than most, it's still just a consumer device. In that context, it seems fishy that a consumer device could easily a 100/100 connection when your experience suggests something different.