I suggest you reread my statement. It was correct and you clearly didn't read or didn't understand it. I'll repeat to give you another try.

Doubtful, particularly when that cost is considered as part of the TOTAL cost for the bike... Many people routinely spend that and more, already, for battery light.

And while your statement doesn't have any relation to mine, I will also point out that very few bike shops sell dyno lighting... So it can hardly be expected they would sell much of it. Never the less, the typical cost of a dyno system is very comparable to any quality battery system. ie, any system not manufactured in China (with its slave labor and zero regulations)...