While it's true that a new OTS cam is only about $50 cheaper than a custom, there's one thing that OTS cams have that custom ones will never have....and that's a used market. A used TFS 1 cam can be had for as little as $100-$150. That makes it $200-$250 cheaper than a custom grind and well worth the money.
I kinda chuckle the way people get so worked up over "custom cams" The performance at that level is minuscule. So much so, that considering the plethora of various OTS grinds out there, you'd be hard pressed to find a custom grind that really makes any notable difference in either power or drivability. And any small differences made are usually only realized as a handful of ponies on a dyno graph.
These stories you hear about guys claiming they picked up 20hp and vastly improved drivability by going with a custom grind over their previous OTS cam have only done so because of one reason and one reason only.....they were reckless in their initial OTS selection (probably grabbed a B-Cam because they got it cheap at a swap meet) and picked the wrong cam to begin with.
OTS grinds are that for a reason....because they're a proven match for a vast majority of combinations and driving situations. There are only 360-degree's in a circle and only so many ways a camshaft can be ground. How much better exactly at these power levels can you realistically expect that custom cam to be? I see guys at the track running unremarkable combinations, with off the shelf parts kicking ass and taking names all of the time. Don't get sucked in to the custom cam craze. Save the custom grinds for high dollar builds, where they were intended.