Basically, i think, for this reason:
There are two "main classes" of LPMs ..... industrial built, and homemade / hobby / small series built.
Industrial built ones (just as example, from Coherent, Ophir, and other "big" manufacturers), are lab-grade stated instruments, that costs a lot of money (is not rare to see 3 "zeroes" in the price tag ..... before the decimals, ofcourse
), and dropshippers don't manage with these products, usually.
The other ones (we can call them "homemade", just for simplicity), does not have industrial certifications, so cannot be regularly sold from a company like a dropshipper or a distributor.
Be clear, "homemade" don't mean "bad", in this case ..... peoples like lasersbee, Ken, Nospin, MM (Radiant) and so on, build good instruments, for our hobby use ..... i also usually build my own ones ..... they just don't have all the required certifications, documents, tests, paid taxes and permissions (overall these ones
), for become internationally selled from big dropshipping companies ..... i mean, if you sell some of them from a private to a private, none say nothing, but start to sell them on regular basis through a dropshipper or company representative, and let the "big ones" notice you, and you become submersed from injunctions, court orders and requests of payments before you even realize what's happened
companies like o-like, rayfoss, DL and the rest probably also dont have he time (or the money) to stock and sell LPM's
