You could, but at that price it would most likely be a full desktop running pfsense, and who wants that kind of power draw at home? Comparable low-power pfsense boxes are about the same price, or even more for the ones advertised on the pfsense website[1].
The OnHub spec page mentions a draw of <36W[2], which is more than I would have guessed, but it's still less than most desktops. For a device running 24/7 in a residential setting, it makes sense to be low-power.
I wouldn't really call it a full desktop. Intel DQ77KB mini-itx, lga1155 with dual Intel nics is what we use for $100 off Amazon. Pair it with a cheap Celeron and some used laptop memory off ebay. At the wall ~15W.
Right now I have one of them with pfsense and its openvpn server running. But that one was upgraded to an Intel i5-3470T so it pulls about ~25W. We went with that cpu for it's AES stuff but it turns out that pfsense (or maybe its freebsd, not sure) can't completely take advantage of it. But otherwise it works great for a vpn that we use when we're outside and on mobile.
Another with a Celeron G1620 is running as an vsphere server. I really love the board.
My point was simply a comparison, yes I should have provided my depth. But at $200 for a premium consumer grade router you are definitely within the realm of a nice pfsense (or alternative) system.
