Knobs on the right instead of the left?

I'm trying to figure out why some variometer manufacturers place the knobs on the right instead of the left of their instrumentation.
Ilec, LXNav and Butterfly/Air Avionics place their knobs on the right.
ClearNav place them on the top left and bottom right.

Considering that most people fly gliders with their right hands on the stick and their left hand moves around the cockpit for flaps, airbrake, cable release etc. it seems to be counter intuitive to have the knobs on the right as operating right handed instruments with one's left hand obscures the instrument when making adjustments.
The alternative is to keep swapping the hand holding the stick in order to use one's right hand on instrumentation. Is swapping hands what most pilots prefer doing? Personally I'd rather teach my left hand new tricks.

Cambridge (302), LX Navigation (EOS) and Winter Instruments place the knobs on bottom left which leads me to the conclusion that either they did more research into cockpit layout and ergonomics than the other manufacturers, or pilots really prefer using their right hands for most tasks.

Alternatively this is a way for manufacturers to promote the sales of their "remote sticks".