That's what I'm thinking; if in OW training a LDS could educate students about & make the case for BP/W, while a BP/W setup can be cheaper than some jacket BCDs, wouldn't it raise the odds that LDS would sell more BCDs (BP/W in this case) to students, instead of the students getting online with LeisurePro, etc...?
Things that are mainly used 'off the rack' make for easy online ordering. Things you need to try on, or get help with fitting, are another story. I'm aware some places may send you a wetsuit, if it doesn't fit send it back for another, but not everyone wants to hassle with that.
The more a LDS can legitimately make its offerings 'not off the rack,' the greater the case to buy for them...if there's true added value.
Richard.