Bootleg Gundams and Figures

Member Gordon has more pics of bootleg Gundams and Figures found at his local store in Singapore.
Items with yellow stickers are half price of what originals cost.
Does this mean there is a tacit understanding that yellow-sticker-items are bootlegs?

Have any of you purchased or would purchase bootleg figures knowing that they cost half of what originals cost?
The thing is that some original figures can be discounted up to 70% off the original when it comes to a sale time. I notice Amazon Japan discounting heavily when they order too many of one figure. Some of the discounted figures are crap but some are good.