Let's Chat!: What Yarn to Keep, What Yarn to Give?

The Let’s Chat series is a thread on my Ravelry forum where a new conversation topic related to knitting is posted every week. Participants in the threads are entered into a monthly giveaway where they can win either one of my patterns, yarn in my stash or receive a surprise package filled with goodies from Japan!

Yarns that I would never give away because they are so scratchy

My lovely moderator on my Ravelry forum is in charge of asking the "Let's Chat" topic every other week to help me out a bit (my mind is not that great at asking creative questions). This week she asks: 

How do you determine what yarn to keep for yourself and what yarn to use as a gift/other people/charity?

I'm not going to lie, this is a tricky question for me since the majority of the yarn I purchase are for design projects, and I no longer have the luxury of going to a yarn store and making impulsive purchases (it has happened before though). However, since the yarn swap, I have found some balls of yarn that I've exchanged for something new - sock yarns, leftover fingering weight yarns... I usually try to exchange good quality yarns that I know I won't have any use for in the future. Any acrylics I have in my stash are for the "donation" pile.

I do need to keep some of my yarns that I know can't be used in any future projects for swatches, testing out design ideas, practicing stitches and experimenting with different constructions. I keep these ones because they are low quality yarns (see image above) so I don't think many knitters would appreciate them (they are ridiculously itchy) but still serve a purpose.

The yarns I keep, as mentioned before, are ones that are going towards design projects, and are often high quality yarn brands, thus were quite expensive. Haha!

So how about you? What yarn do you guard for yourself, and which ones are you willing to give away? Join in on the conversation on the Ravelry forum!