Im just switching my GPU back from Amicable Numbers to GPUGRID, so I get your point.
I'm not a huge miner like you @dutch so the opportunity cost for me is no-where near as pronounced, and over time I tend to flip-flop around projects.
It's important to keep the science close to your heart, like me you are are long time BOINCer and the money is a fringe benefit, but hopefully some of those attracted by the money have caught the BOINC bug as well; that is one of the core missions of Gridcoin.