That's Nairobi for you, and sadly, the rest of Kenya too. Most people are in business not because that's what they wanted to do but because they lacked something else to do. For most, business was nowhere near their career choices and as a result most don't bother to know their products or their line of business fully. You end up being, as the customer, the one educating them on their products and services (anyone who has ever dealt with orange customer care here must surely know what I'm talking about 🙂)
The trick here is for you as an fta enthusiast is to thoroughly do your research and walk into the shop confidently knowing what you want and accept no less. So many times I've been called by pals saying eti niko hapa kwa hii duka na wanasema hawana ile decoder nilikuwa nataka but kuna ingine wananiambia pia ni poa, and when you ask the name you realize it's one of those substandard things with no support nd names you've never heard of.
Always know that these guys are, first and foremost, businessmen. Stock lying on the shelves haiwasaidii and they'll do anything, including lying, to have you take it away at their price. Realize that for that very reason, they do not really have your best interests. Only you have your interests at heart. It's a jungle out there and you are, literally, on your own. Hopefully we shall have equipped you here on this thread with the skills you need to fearlessly and safely navigate the minefield that the open market is. But I digress. Back to FTA.