Bungy, I understand where you're coming from. I've bought shrimp badged as sakura in the past and have ended up with some very different shrimp. Some high grade like yours and some pretty colourless.
However, I think the same argument you make would therefore have to apply to crystal grading too (e.g. the one on planet inverts everyone uses). I.e. you'd have to say a SSS grade is still just a bog standard crystal red. The grading guide I posted is in no way as established and I'm not entirely happy with it (e.g. I think the low grade sakura grade is confusing). BUT I do think such guides are useful because they give a buyer some indication of what they're getting.
Most people who are interested in cherries know that the term sakura denotes better colouration than bog standard cherries. IMHO by refusing to call yours anything but cherry you are misleading buyers, albeit to your own detriment. Fair play to you for selling them at those prices though. You could get a lot more for them. I've see that grade being sold in shops for five to six quid. I've sold my sakuras, which aren't up to yours, TO shops for a fair bit more than what you're selling yours for.