There is always SOMEONE who likes a scent. Unless it's just gaggingly heinous. I have tons and tons of sample sizes but I rarely make a batch small enough to test. For me personally, I don't want to waste my time making a teensy batch of soap. Sometimes I get a wild hare and will make a batch and divide it 8 or so weighs and test 8 FOs that way. Personally, I stick to soap suppliers, or fragrances recommended here. I've never had a fragrance for a soap supplier (somebody who tests FOs in soap) totally fail me. I've had them discolor or fade a bit, or be kind of "meh" but I've never had one be totally gross.
I've been using up my sample bottles by combining them, either with other samples or with something I think is similar or complementary. It's a bit of a gamble, but I think that even if they fade, I will end up with a lighter scent, since I'm not relying 100% on that untested sample. I also make lotion and candles with some of my samples, since a little goes a long way in lotion.
"You get what you pay for" is also a factor here. Some cheaper suppliers - such as Just Scent - I've dropped from my list. They don't test in soap, and I've had too many faders. Not willing to order a bunch of samples, test, then re-order in larger quantities. I don't order from candle suppliers unless I get a recommendation on specific scents from people here.