If you knew anything about nails (which you say you don't) you would know that nail techs cannot tell by eye if a products is cured or not, so have no idea if they are causing harm or not. So kindly keep your uneducated opinions away from an educational forum.
You (and the rest of us) have no idea of the cost price of a lamp but I know the R+D costs have to be recouped. Profit is not a dirty word and profit is what enables CND (and others) to innovate and create to improve the nail industry.
Do you know if all of you cynics and messers want to put the health of your clients at risk, carry on. When your paying clients are fed up of being short-changed they will come elsewhere to techs like me (and many of my knowledgeable and talented geeky friends) who have invested the time and money in their education to know that offering a top quality service is what keeps clients coming back and paying premium prices.
So crack on with your fleabay lamp and carry on short-changing your clients. Btw, your insurance will be invalid with your fleabay lamp, so good luck when you cause an allergic reaction