I do sometimes think there should be an "aptitude test." Personally, I REFUSE to install bees for someone. If they want to keep bees, they need to do it themselves. I did have a lady a couple years ago offer me money to come install her bees. I told her "its springtime and I am a beekeeper. there is NO WAY I have time to drive to your place and install your bees." I offered that If she came in the late afternoon, I could install a nuc in one of my own hives so she could see how it is done, and then take her own nucs home to install at home. I thought that was a good comprimise and she seemed happy with the deal. I am not in the business of doing other peoples beekeeping, but I suppose if you are in the right location, that could be your business...
A few things. First I start taking orders in February and am usually sold out by the end of march. Although I do take a "waiting list." This keeps away the people who with little foresight who buy a hive body in may and go looking for bees. Those people I tell them to spend the summer looking for a mentor, reading, and call me next february. Most people are pretty good about asking questions if they are completely green, or even more experienced.
I also try to have a conversation with them when they place the order. I am very open to answer questions whether phone or email. I make sure they know they need to feed, and if they mention jar type feeders I will happily sell them a frame style feeder. I also make sure they at least know the local bee club exists. Its up to them to go to meetings but the wont if they don't know about it. Oregon has a great master beekeeper program that pairs students with mentors and one of the local extension offices does a monthly day in the apiary. I also will recommend a book or two and a subscription to the american bee journal, or at least try to pawn off a stack of back issues.
I don't think there are many beekeepers who feel very good about selling bees to people who they perceive to be doomed failures.
Personally, I really want people to be successful. I feel elated when a past nuc customer becomes a queen customer. That means they are figuring it out. And while I cannot devote a huge amount of time helping beginners, we do our best. I happily talk at the local bee-club when asked and typically we offer a hands on workshop at least once a year at our shop (we haven't done it this year because Kids take a lot of time and are way higher on my priority list). I have also had people come and "help" for a day or an afternoon. "help" sometimes is just schlepping a bucket of syrup and talking about what I am doing, but I have had a couple people show enough competence to pull brood/requeen.... All of these things take time, but in the long run make me feel like we are doing our best. It is also really good for customer relationships and brings us lots of return customers (again, doesn't make me super happy but at least they aren't upset with me and don't go looking for someone else's nucs). Those customers also give lots of good reviews and when their acquaintances want to start bees, they send them to us.