These skills are equipment independent, (which the exception of helicopter turns and back kicks which can be damnably hard in the wrong fins). I agree that it would be nice if LDSs were to rent "tech gear" but I don't think that the demand is there. If it were, then they would. Shops rent one of two types of gear, either the cheapest that they can get away with or the best that they have that they want to sell. There are lots of rather obvious reasons as to why they do this and "tech gear" rarely fits into either category, though you'd think that LDSs would cotton to the concept that with a BP/w one size fits all and the need for a bunch of different sized BCDs goes away.
Having gone through this with a couple of different shops, I assure you that in our neck of the woods, carrying unsold tech inventory is a potential financial disaster which owners rightfully fear. Where Bob lives there is enough of a market to justify that risk; in our area the market is small indeed.
A couple of years ago a SB member who is a shop owner (I think it was Phil Ellis--could be wrong) cited industry statistics indicating that BP/Ws constituted less than 1% of total BCD sales in the U.S. the previous year. Of that 1%, I would bet that a handful of locations made the majority of those sales. That means the market is pretty much nonexistent in other places. When you further consider that some of the companies that make this equipment require contracts guaranteeing a pretty hefty amount of annual sales, you have a very big incentive for a LDS to stay out of the market and leave the risk to a competitor.