Ebay lasers are mostly pen lasers which are mass produced and not of very good quality, other lasers are not as mass produced so they cost more. Its like asking why gold cost's more than shiny rocks it's because theirs a lot less gold than shiny rocks even if the shiny rocks may be bigger and shinier. Gold still has the effect of being unreactive so it will last ∞ longer than shiny rocks. Ebay lasers will last a few months or years if your lucky, whereas more expensive lasers CNI etc will last 10+ years or a lifetime if you treat them well.Someone pointed that they bought a 100mw 405nm laser for $4.
In other postings, I saw that the same laser by US company can go up to $50-$60. Do it mean are these company earning >90% gross profit just because they label it correct
hmmm not 100% true.You get what you pay for!
Do you mean this? New Powerful 5mW Green Purple Beam Light Laser Pointer Projector Pen +Star Cap | eBayThese pens are almost everywhere. They are mass produced and quality check is very loose or not present at all resulting in very cheap prices