I don't think it's CRUCIAL, but it definitely makes your packaging and shop more memorable. I try to put my name on my products so that the customer remembers who I am! There's so many ways to make your own packaging, and I think it's a fun way to work on your shop. I've found super effective ways without spending a bunch of money. I make my own stickers using a xyron sticker making machine, I personalize my jewelry display cards by incorporating stickers of my logo onto them, and I buy ribbon in the same colors to tie it all together. To keep costs low, I try to find as many ways to produce my own packaging as I can. At the very least, invest in business cards! You can create amazing ones (and amazing quality) at moo.com. If you haven't used it already, you can get 50 free ones just for having an etsy shop!
Here's the link:
http://us.moo.com/partner/etsy-business-cards/For an example of my packaging:
https://www.etsy.com/listing/159614999/better-call-saul-teal-breaking-bad-stud?ref=shop_home_activeGood luck! :)