In 2011 I had a DDOS from few million IP's on a site hosted in mojohost and they handled nicely, setup a (4? 16? forgot) gigabits firewall in front of my normal 1gigabit line server, however that was not meant to be a normal service they provide, I mean to host DDOS'd sites for a regular price. There's some companies who do it let you pay all the DDOS traffic so even if your server keeps up, it cost you quite for bandwidth (they use DNS to redirect the DDOS to their server then jumb back to your real server only what's good), mojohost at the time said if DDOS had to continue, we had to use service of those companies which with such DDOS traffic I had, would cost several $10,000's a month. I try to remember what these companies, one was dragonara.net , I went now and site not loads LOL I suppose a DDOS won against them. This one loads
http://www.staminus.net/PROTECTED , I see 10 Gbps or 1,000,000 PPS DDoS Protection cost 2249/mo. I think you simply pay the bandwidth.