It's either that or related to the prior discussion of their inverters not yet being certified as revenue-grade. Especially in PA, which has lower SREC prices than MD, I tend to doubt Tesla gets much of anything out of it (when factoring in all the costs involved in registering and the cost of the upfront payment.)Yeah, I'm sure Tesla worked out that buying the SRECs was integral to them being able to continue offering their lower prices. It's unfortunate they're giving customers fewer choices, but the ROI is still so much lower when you can get the upfront investment cost down that low.
But in either case, it is typical of Tesla to come down with few, simple (for them) rules. I see no reason why somebody shouldn't be able to opt out of selling the SRECs, even if Tesla tells them they are on their own to figure out how to register and meter the production. But Tesla clearly - at least for now - just doesn't want to deal with it. It sort of reminds me of how difficult it apparently is for those few customers who want to grid charge with solar (instead of taking the ITC.)