I think the difference between the 'old days' of Avon ladies, tupperware parties etc and the modern era of JuicePlus, 'Younique', those weird Aloe Vera products etc is that although both are pyramid schemes and still, to me, a 'scam', (a) the products from Avon/Tupperware were reasonably good quality, sellable products albeit a tad overpriced once you accounted for the cut taken by the various levels of the pyramid/middle men, but it was possible to eek a small profit out of selling them if you were at the bottom of the pyramid if you worked hard at it (probably less of a profit than you'd 'earned' given the time you'd spent on it, but at least some profit) and (b) although the sales tactics could be aggressive (I remember my DM hiding behind the sofa from our local Avon lady when she called because she was so relentlessly pushy and some of the Tupperware 'parties' were the stuff of nightmares), it wasn't as pervasive as today because there was no social media, no mobile phones, it was mostly done by landline phone/door to door/selling to friends and family, and if one of them got a bit OTT about it you could just avoid that person, not answer the phone to them etc
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Whereas some of the stuff MLMers sell today is both absolute shite, particularly given with online shopping you can easily find much better skincare/fruit juice/make up, delivered to your door without the huge mark-up (and it isn't possible for the sellers to really make a profit even if they do manage to sell because they can only buy them from the company at a high cost), and also the selling is relentlessly in your face, they are taught to be constantly on facebook, twitter, whatsapp all the time constantly hawking their shit. Plus the fake 'lifestyle', the whole 'boss babe' thing is really pervasive and annoying and was never a feature in the 'old days', you know that anyone who really is making more than a tiny profit from MLM is only doing so by effectively scamming others - for me and most people I know it's more a minor annoyance and of course you can block/mute if it gets to be too much, but it can really negatively effect vulnerable or desperate people - not just the ones who get sucked in themselves but also those who don't realise it's all fake can get really down on themselves because they aren't 'living their best life', running their own company, driving a ferrari etc., which isn't really fair...