Yeah, probably more of a PITA than it's worth.
My theory as to why there is no CLink for the MAC: Many/most MAC users I've talked to are fan-boys/girls because 1) the MAC is "pretty", 2) they have no need to know how things work as long as they do, and 3) they just use it for graphics. So - and I'm generalizing here, the common MAC user is not tech-inclined and would probably never get into the R/C hobby where being "techy" is all but a requirement. Following that logic; since most MAC users would not be into R/C, there is no need to put energy/resources into porting the CLink for Mac. Let them use their overpriced hardware with overpriced software (anything Adobe) to make pretty pictures.
Seriously, isn't the MAC OS based on a Linux kernel? I'm sure there is a guru somewhere that can make it work, provided you pay them enough to work at it.
At the end of the day, you can pick up a really cheap/older laptop for about $100-$150 that will run CLink just fine. Give it ~512MB of RAM, throw Win2k or XP on there, and load CLink. And while you're at it, throw a copy of my R/C Calc program on there too and you have something you can take to the track.