Unless your first job happens to be CP heavy, being CP boarded is essentially useless in a practical sense -- you might -eventually- have to help cover call or direct a lab, but you'll probably either be re-learning from scratch or depending on those in your department/practice who do it day-to-day. In a marketing yourself for jobs sense, however, it can certainly be useful. In general no boss -wants- to have to re-educate their employees on CP, so they like to have some CP folks around to cross-cover, regardless of what they remember or how often they actually handle CP duties.
As a hemepath, while there's essentially no practical reason to be CP certified, potential employers may still scratch their heads because they're stuck in outdated thinking and forget that they were just looking at a PhD to replace the heme-onc to do the same job they would rather put under your umbrella.
The "problem" is recertification. If you're not sure you'll recert in CP, then there's really no reason to get it in the first place. Unfortunately it's hard to predict the future because the available jobs are limited enough, and some of them state they prefer someone CP boarded. In the days before recertification, you could spend that 1 year, have the board, and never lose it; now you could find yourself regretting that extra year because your job doesn't require it and you don't really want to recert in it, even though there's a -chance- you'll change jobs and "need" it again -- not necessarily for the job per se, but because your employer prefers it.
And of course what some people forget is that just because someone does AP in 3 years doesn't mean they never do any CP training -- only 24 months have to be AP, the other 12 can be AP or CP (and 6 months of that can be research), although programs may require one do a little more AP service work. Which isn't so much relevant to this thread's question, but it has slowly become what I think some people should pursue, such as those focused strictly on FP.
