Since there are so many scams and scammers out then nobody should ever sell any items anywhere. And only purchased store direct but since Notorious "loukenpeach" ( I'm unsure how to spell) you may still get a counterfeit item there. So I guess we could just shut down completely and live in the fear of being scammed.
But, the trust is being taken out of context it's not like all of the 5500 people that follow me I trust it's impossible to know all of them and which are bogus accounts. However there's about five to six that I have become friends with we exchange cell phone numbers and talk daily I even have a date set to meet one since she lives close and have lunch. Our children are the same age, no not all of them I can meet because we're not all in the same state but it's the same as the friendships that have been made here on TPF, people have become friends and met. They have a section for meet ups. Who knows who your meeting when they meet?
There's also a few TPF members that we follow each other and we all sell our items. And even eBay sellers with a great selling history that have item on eBay also selling the items on Instagram this is where a lot of us who've been selling on eBay for 10 plus years have transition to due to the high fees of selling on eBay. Until you're on there and you become established and see the post and background that forms it's hard to see that it can be a great place to sell and buy.
I'm truly glad it works well for you to sell on IG!