The profit margin on SeaLife is probably higher, but that is for another discussion.
How about teaching multiple levels of classes?
Have an 'intro to underwater photography' course which would be appropriate for the purchasers of SeaLife type products who just want/need a simple camera for taking average photos. There is a market for folks who just wanna push a button and don't care about artistic value of the image (what backscatter?). Look at all the point and shoot cameras for sale in electronics stores (and topside DSLR users who never take their camera out of 'Auto' mode). Maybe the shop owner could loan students SeaLife cameras for the class in anticipation of driving sales?
Then offer more 'advanced' type classes that appeals to the DSLR/advanced camera crowd who want better images. That'll help direct sales to the Ikelite products you prefer. You could branch into other areas such as lighting techniques and digital workflow.
My Sola 800 didn't want to accept a charge after sitting for a few months. Seemed like it didn't want to start charging. I don't recall exactly how the lights were blinking, but it never settled into charging mode.
Initially, I also had no luck rapidly tapping the charging contacts to the light, but then I attempted flipping the charger plug over and tapped the light a few times. In essence, tapping the Positive charger terminal on the Negative contact on the light (and vise versa). After tapping a few times, I flipped the charger back to normal and plugged it in normally. Viola, the light started accepting a charge.