The shop where I'll get mine done charge 80 an hour I think. You're right about it not being cost efficient to dyno tune the ls, but even small gains here and there add up. Compare to NO2, everything else is not cost efficient. Why go with a CAI when it'll give you 5-15 hp when you can get 100 with NO2, Thats 6-20x more hp than a CAI for a little more than double the money.
I'm getting it dyno tuned for sure to get the most out of it, try to squeeze a little more out of her and I'll be able to tell people how much improvement, if any, I got from ILLS tune and if it's worth it to have it dyno tuned. I also plan on comparing my exhausts. How much I gain, if any, by having magnaflows over flowmaster. I'll dyno it, go to the muffler muffler shop to install new exhuast and then dyno it with the new exhaust.