Berserk? That wasn't my intent. Sorry if it came off that way. Just giving advice. I'm not stating that the 8-Led flashlight you described isn't worth $5.
I will concede that it probably is worth $5, maybe even $6!!

Have you ever:

worn Smartwool socks? vs. cheap cotton socks?
sipped XO Cognac? vs. cheap brandy?
sliced and diced with a Wusthof knife? vs. cut yourself with a dull cheap knife?
hiked in a pair of Vasque Sundowner boots? vs. developed blisters with crappy shoes?
plinked with a well-tuned Colt 1911A1? vs. pulled your hair out over a jam-a-matic?
shot cloverleaf groups with a Swedish Mauser? vs. shot 6" groups with a shot-out Turkish Mauser?
Gazed at a Terry Ridlin print? vs. glanced at a black velvet Elvis?


This list could go on forever but I will cut it short. The underlying principal is "You get what you pay for". Buy quality, it lasts forever. Buy crapola, you keep on buying. In the end, which is the bargain?