because those people are very knowledgeable with crabs and CAN do the work themselves. The simple muscle head (like myself) does not have those tuning skills, or the need for a 2 carb set-up (although I like 3), I tuned the heck out of a Eddy 750 for a 383 dart. It ran good. A buddy gave me a 750DP holley he had set up for his 11 second 360 and w/o a tune I dropped a tenth. After 10-15 minutes of tuning I dropped another .8 tenth. I've used both. the eddy's aren't bad they just aren't as easy to work on and they will not match a Holley at the track (for us weekend racers). A used Holley can be had for $75-100, rebuilt in an hour w/ a $50 kit and it will out perform a brand new Eddy 750.