I don't agree at all. Craft store feathers are largely limited to a couple of bright colored boa's - most lack any selection, and they are second quality feathers.
Consider that the fly tying industry is mighty small - and if you add up most of the sales it probably doesn't equal the gross of a Michael's or Joann's ... As such, few items are made for the fly tying industry per se - most are made for other industries - and someone found a dual usage.
All of the yarns and synthetic furs are 1/10 the price of a fly shop - whose tiny 3 yard cards aren't worth the money. Antron, Polypropylene, Z-lon, and all the pearlescent and iridescent materials are from other hobbies or industries, and can be purchased in larger quantities and cheaper prices elsewhere.
Rabbits aren't slaughtered for fly tiers, they're killed for rabbit meat - and Hareline buys rabbit skins from the same supplier the glove makers use - nothing is special about the fur.
I do believe in supporting the local shop - and buy my genetic chicken necks (which are grown for fly tiers) from them - but skip buying copper wire, floss, yarn, rabbit fur, mohair, rubberlegs, bead chain, and animal fur - as I can buy from better sources, get a larger selection, and pay less to boot.
These are tough economic times - and I'll pocket the difference and pay my mortgage instead.
When you find the "source" for a material, like Ice Dub, you begin to think differently, considering you can buy a pound for $45, and they sell 1/8 ounce for $3.00.
I'm with the craft stores - I'll support the fly shop with the large dollar items like rods, lines, and reels - but just because it came from a shop doesn't mean it's better quality - nor does it mean it's free of moth eggs. Considering the "harsh" chemicals I use to quarantine ALL NEW PURCHASES - I don't care what the feathers smell like when removed from the bag, they'll smell a lot worse after they've be nuked...