Freebies are a nice bonus, but I never count on them in my order. I dont think I've ever gotten a "mix" as a freebie, though I have ordered mix packs before. Mix packs are "like a box of chocolates".
My favorite type if freebie is an extra seed or two of the ones I ordered. Sweet Seeds 3+1 deal comes to mind.
I often share my freebies with new growers, so knowing what to expect is a good thing. What I don't like is getting photoperiod freebies with my autoflower order, or vice versa.
Share the green....that's what it's all about. Or do most hoard freebies? Another afterthought meandering....
We grow out maybe 30% of freebies received and spread the love around to those wanting something new.